Tcl, 78 75 bytes

_{^{Thanks to sergiol}}

if $argv<2 {exit 1} incr d while {[incr d]<$argv} {if $argv%$d==0 {exit 1}} 

_{^{Original version}}

if {$argv<2} {exit 1} incr d while {[incr d]<$argv} {if {$argv%$d==0} {exit 1}} 

Works for all integer values (both negative and arbitrarily large). However, as this aims to be short and not efficient, it is written with a simple divisor={2,3,4,...} loop, so you'll begin getting noticeable lag around eight digit numbers (n ≥ 10⁸).

The input is taken on the command-line; the output is an exit code: 0 for prime and 1 for not prime.

On Windows you can use the following batch file to test it:

@echo off tclsh a.tcl %1 if ERRORLEVEL 1 ( echo not prime ) else ( echo prime ) 

Use it as:

C:\foo> run.bat 2017 prime 

*On nixen you can use the following bash script to test it:

#! /bin/sh tclsh a.tcl $1 if [ $? -eq 0 ] then echo prime else echo not prime fi 

Use it as:

% ./run.sh 2017 prime 

Enjoy!

Tcl, 78 75   74 bytes

_{^{Thanks to sergiol}}

if $argv<2 {exit 1} incr d while {[incr d]<$argv} {if $argv%$d<1 {exit 1}} 

_{^{Original version}}

if {$argv<2} {exit 1} incr d while {[incr d]<$argv} {if {$argv%$d==0} {exit 1}} 

Works for all integer values (both negative and arbitrarily large). However, as this aims to be short and not efficient, it is written with a simple divisor={2,3,4,...} loop, so you'll begin getting noticeable lag around eight digit numbers (n ≥ 10⁸).

The input is taken on the command-line; the output is an exit code: 0 for prime and 1 for not prime.

On Windows you can use the following batch file to test it:

@echo off tclsh a.tcl %1 if ERRORLEVEL 1 ( echo not prime ) else ( echo prime ) 

Use it as:

C:\foo> run.bat 2017 prime 

*On nixen you can use the following bash script to test it:

#! /bin/sh tclsh a.tcl $1 if [ $? -eq 0 ] then echo prime else echo not prime fi 

Use it as:

% ./run.sh 2017 prime 

Enjoy!

Tcl, 78 bytes

if {$argv<2} {exit 1} incr d while {[incr d]<$argv} {if {$argv%$d==0} {exit 1}} 

Works for all integer values (both negative and arbitrarily large). However, as this aims to be short and not efficient, it is written with a simple divisor={2,3,4,...} loop, so you'll begin getting noticeable lag around eight digit numbers (n ≥ 10⁸).

The input is taken on the command-line; the output is an exit code: 0 for prime and 1 for not prime.

On Windows you can use the following batch file to test it:

@echo off tclsh a.tcl %1 if ERRORLEVEL 1 ( echo not prime ) else ( echo prime ) 

Use it as:

C:\foo> run.bat 2017 prime 

*On nixen you can use the following bash script to test it:

#! /bin/sh tclsh a.tcl $1 if [ $? -eq 0 ] then echo prime else echo not prime fi 

Use it as:

% ./run.sh 2017 prime 

Enjoy!

Tcl, 78 75 bytes

_{^{Thanks to sergiol}}

if $argv<2 {exit 1} incr d while {[incr d]<$argv} {if $argv%$d==0 {exit 1}} 

_{^{Original version}}

if {$argv<2} {exit 1} incr d while {[incr d]<$argv} {if {$argv%$d==0} {exit 1}} 

Works for all integer values (both negative and arbitrarily large). However, as this aims to be short and not efficient, it is written with a simple divisor={2,3,4,...} loop, so you'll begin getting noticeable lag around eight digit numbers (n ≥ 10⁸).

The input is taken on the command-line; the output is an exit code: 0 for prime and 1 for not prime.

On Windows you can use the following batch file to test it:

@echo off tclsh a.tcl %1 if ERRORLEVEL 1 ( echo not prime ) else ( echo prime ) 

Use it as:

C:\foo> run.bat 2017 prime 

*On nixen you can use the following bash script to test it:

#! /bin/sh tclsh a.tcl $1 if [ $? -eq 0 ] then echo prime else echo not prime fi 

Use it as:

% ./run.sh 2017 prime 

Enjoy!

Tcl, 78 bytes

if {$argv<2} {exit 1} incr d while {[incr d]<$argv} {if {$argv%$d==0} {exit 1}} 

Works for all integer values (both negative and arbitrarily large). However, as this aims to be short and not efficient, it is written with a simple divisor={2,3,4,...} loop, so you'll begin getting noticeable lag around eight digit numbers (n ≥ 10⁸).

The input is taken on the command-line; the output is an exit code: 0 for prime and 1 for not prime.

On Windows you can use the following batch file to test it:

@echo off tclsh a.tcl %1 if ERRORLEVEL 1 ( echo not prime ) else ( echo prime ) 

Use it as:

C:\foo> run.bat 2017 prime 

*On nixen you can use the following bash script to test it:

#! /bin/sh tclsh a.tcl $1 if [ $? -eq 0 ] then echo prime else echo not prime fi 

Use it as:

% ./run.sh 2016 prime 

Enjoy!

Tcl, 78 bytes

if {$argv<2} {exit 1} incr d while {[incr d]<$argv} {if {$argv%$d==0} {exit 1}} 

Works for all integer values (both negative and arbitrarily large). However, as this aims to be short and not efficient, it is written with a simple divisor={2,3,4,...} loop, so you'll begin getting noticeable lag around eight digit numbers (n ≥ 10⁸).

The input is taken on the command-line; the output is an exit code: 0 for prime and 1 for not prime.

On Windows you can use the following batch file to test it:

@echo off tclsh a.tcl %1 if ERRORLEVEL 1 ( echo not prime ) else ( echo prime ) 

Use it as:

C:\foo> run.bat 2017 prime 

*On nixen you can use the following bash script to test it:

#! /bin/sh tclsh a.tcl $1 if [ $? -eq 0 ] then echo prime else echo not prime fi 

Use it as:

% ./run.sh 2017 prime 

Enjoy!