The 9th square number is 81
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To find the square root of a number you multiply that number by it self twice.(example) the square root of 9 ? the square root of nine is 81 as 9X9=81. square root of 4 ? th square root of is 16 as 4X4=16.
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.