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  1. or download this
    my $x = 125;
my $l = log($x) / log(5);

...
print "int(LOG) == ", int($l), "\n";

print "Are equal: ", ($l == int($l)) ? "true\n" : "false\n";
  2. or download this
    LOG      == 3
int(LOG) == 3
Are equal: false