The firstidx
function from List::MoreUtils can help:
use strict;
use warnings;
use List::MoreUtils qw(firstidx);
my @nums = ( '830974', '722065', '722046', '716963' );
printf "item with index %i in list is 722065\n", firstidx { $_ eq '722065' } @nums;
__END__
item with index 1 in list is 722065