Befunge 93, 44 bytes

&:v>0.@ @.-1< 03<_v#%p03+1:g03::_^#`g 

This works by trial division.

There's a hidden unprintable character between the v> on the first line; it's the character whose value is 2. The base64 of the file is as follows:

Jjp2Aj4wLkAgICAgICAgQC4tMTwKMDM8X3YjJXAwMysxOmcwMzo6X14jYGc= 

Try this out here.

Befunge 93, 44 bytes

&:v>0.@ @.-1< 03<_v#%p03+1:g03::_^#`g 

This works by trial division.

There's a hidden unprintable character between the v> on the first line; it's the character whose value is 2. The base64 of the file is as follows:

Jjp2Aj4wLkAgICAgICAgQC4tMTwKMDM8X3YjJXAwMysxOmcwMzo6X14jYGc= 

Opening it as hex in Sublime Text looks like this (newline confusion, though):

263a 7602 3e30 2e40 2020 2020 2020 2040 2e2d 313c 0d0a 3033 3c5f 7623 2570 3033 2b31 3a67 3033 3a3a 5f5e 2360 670d 0a 

Try this out here.