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use strict;
use warnings;
...
my $elapsed_time = tv_interval($start_time);
say "$prime_candidate is a prime " if  $is_prime != 0;
printf "The [$0] script took %2.2f seconds to finish\n", $elapsed_time
+;

$ perl time_is_prime_v1.pl 
Enter the integer: 99929
...
$ perl time_is_prime_v1.pl 
Enter the integer: 1320486952377516576  
1320486952377516576 is not a prime