20 is not the square of an integer, the square root of 20 is approximately equal to 4.472.
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20
20 = 20(1/2) x 20(1/2) = 4.4721359549995824.4721359549995793928183473374626
25 is a perfect square occurring between 20 and 30.
20 squared is 400.
A square number is an integer which is the square of some smaller integer. For example, 144 is square because 144 = 12*12 = 12^2 400 is a square number because 400 = 20^2. Anything bigger than 20, when multiplied by itself, will make a square greater than 400. How about 21?