The numerator and denominator are mutually prime (no common factors), and thus the fraction is fully reduced. How else would you represent it as a fraction?
#!/usr/bin/env perl -l
use warnings;
use strict;
#####
# [id://56906] for quick gcf
sub gcf {
my ($x, $y) = @_;
($x, $y) = ($y, $x % $y) while $y;
return $x;
}
######
print gcf(49420098210293,100000000000000); # prints 1
#####
use Math::Prime::Util qw/is_prime factor/;
print is_prime(49420098210293); # not prime (I wasn't sure
+ when I started my answer)
local $, = 'x';
print factor(49420098210293); # 113x4729x92481709
print factor(100000000000000); # 2x2x2x2x2x2x2x2x2x2x2x2x
+2x2x5x5x5x5x5x5x5x5x5x5x5x5x5x5
# no common factors