Write a procedure ISPRIME whose input is a positive integer n and whose output is true if n is prime and

false otherwise. Test the procedure on the following numbers:

$1,2,3,4,11,111,531,7919,15689,262681$

The answers should be

false, true, true, false, true, false, false, true, false, true.

Hint: Here's a start for the program:local d;

if n $<mtext></mtext><mn>2</mn>$ then return false; end if;

if n $=2$ then return true; end if;