Yep, pardon: it is checking if the square root is single digit, but still not related with the actual scope of the kata.

Your code is doing something just slightly different than checking if the number is single digit.
It's checking if the square root of the number is single digit. When numbers get bigger your code fails.

I can't see how your code is testing correctly for the required condition (you are just testing that each number is single digit...), but, anyway, remember to format the code with the git flavored mark-down, for better readability :)

Which language?