is_prime
ABSTRACT 
 Determines whether or not the input integer is prime
 PARAMETERS 
 | n | the input integer | 
RETURN 
 1 if the input integer is prime, and 0 otherwise
 DECLARATION 
 func is_prime(n)Determines whether or not the input integer is prime
| n | the input integer | 
1 if the input integer is prime, and 0 otherwise
func is_prime(n)