20
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20 is one of the two square roots of 400.
Prime numbers can't have whole number square roots, of course, but the largest prime number under 400 is 397.
-15 15
A number multiplied by itself is the square of that number. The reverse procedure is the square root. You can get help for square roots from you teacher, a tutor, a student who understands square roots, etc.
square inches do not have square roots only number have square roots.