Refactoring causes a ton of duplicate solutions being posted. Is there no way to edit a solution without creating a duplicate? There should be.

Shouldn't the test validate_pin("a234") == False be invalid for this task since an ATM doesn't have alpha characters as input keys?

Pleae add this as a default test:

test.assert_equals(is_square(152415789666209426002111556165263283035677490), False, "152415789666209426002111556165263283035677490 is not a square number")