$ perl time_is_prime_v1.pl 
Enter the integer: 99929
99929 is a prime 
The [time_is_prime_v1.pl] script took 0.79 seconds to finish

$ perl time_is_prime_v1.pl 
Enter the integer: 999983
999983 is a prime 
The [time_is_prime_v1.pl] script took 7.69 seconds to finish


$ perl time_is_prime_v1.pl 
Enter the integer: 9999991
9999991 is a prime 
The [time_is_prime_v1.pl] script took 73.97 seconds to finish

$ perl time_is_prime_v1.pl 
Enter the integer: 1320486952377516576  
1320486952377516576 is not a prime