because you can multiply a number (in this case 3) by itself and get that number
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3 is the square root of 9. 9 is a square number. 9 is the square root of 81. 81 is a square number.
What you have to do is multiply that number by the same number for example 3x3=9 so 9 is a square number.
-4
The square root of 81 is 9. The square roots of 81 are 9 and -9.
The 9th square number is 81