1. I am a square number less than 225. The sum of my digits is 4. What square numbers might I be? There is more than 1.

Hm maybe 2 and two 1’s?

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.