1, 4 and 16.
A factor that is a square number. 16 is a square factor of 32.
How about: 32*32 = 1024
The only square number in that range that has 32 as a factor is 64.
16
16 2*16 = 32
16 is an even, square, two-digit factor of 32.
64
16
1, 4 and 16 are square numbers that are factors of 32. Of these, 4 and 16 have two as their only prime factor and 1 is odd.
16
16
16.