log returns a floating-point number, so the results are prone to floating-point inaccuracies:
$ perl -wE 'printf "%.20f\n", log(125)/log(5)'
3.00000000000000044409
A safer test is something like this here, which only uses integers:
use strict;
use warnings;
use 5.010;
sub is_power_of {
my ($num, $base) = @_;
while ($num > 1) {
return 0 if $num % $base != 0;
$num /= $base;
}
return 1;
}
say is_power_of(125, 5);
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