Answer:
There are 5 numbers
Explanation:
First, the number must be a whole number and divisible by 4.
20^2 is 400.
And there are 4, 8, 12, 16 ,20; 5 number divisible by 4.
23^2 is already 529.
The next number divisible by 4 is 24 which is over 500.
So there are 5 numbers. They are 16, 64, 144, 256, 400.
