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isprimedoes an APR-CL primality proof, so does slow down quite a bit as inputs get very large.ispseudoprime(input)does an AES BPSW probable prime test, which will be much faster for over 100 digits. Still no known counterexamples after 35 years. Version 2.1 and earlier of Pari, from pre-2002, uses a different method that can easily give false results, but nobody should be using that. \$\endgroup\$i->isprime(i)or justisprime, that's shorter? \$\endgroup\$input()and writing withprint(...). However, I thought a function likefoo(x, y) = { z=bar(x); if(y, return(y*z)); z }or something was a "full program" in PARI/GP. It is not usual to doinput()andprint(...), more common to use return values (functional language). \$\endgroup\$