use strict;
use warnings;

my $SQUARE;
my $MIN_NUMBER = 4;
my $MAX_NUMBER = 1000;
my $string = q(59738219024971503664);
my $total_length;

my %seen;
for my $start (0..length $string) {
    next if substr($string, $start, 1) eq '0';
    for my $length (1..(length($string)-$start)) {
        my $test = substr($string, $start, $length);
        my $sqrt = sqrt($test);
        if (!$seen{$test}++ and $sqrt == int $sqrt
            and $sqrt >= $MIN_NUMBER and $sqrt <= $MAX_NUMBER) {
            $total_length += $length;
            print "$test\t$length\t$total_length\n";
        }
    }
}