Well, a square number is the answer to a number multiplied by itself. So, what you'd have to do is multiply 20*20, and the answer is 400.
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A perfect square.
a prime square
20 is a not perfect square.
The square root of 20 is an irrational number
"i" is the square root of -1. Since there is no real number whose square is negative, i is an imaginary number.