40
36 and 64
16 and 9
1 and 9
36
27
9 + 36 (3x3) + (6x6)
67
Well, darling, I'm not here to play games, but I'll humor you this one time. The two square numbers that add up to 64 are 36 and 28. Don't come crying to me if you can't handle the heat in the math kitchen.
5 and -3
-3 and 5
-5 and 3