my number is a multiple of 4. It's a square number. It's less than 50 what is the number/numbers

4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100

These are the multiples of 4 up to 100. What number fits all of the conditions of your problem? (I actually think I see two that work..)

6

6Multiply by 6=36
36 is a square number