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Sometimes the square root of a positive number can be irrational, as in the square root of 2 (which is a non-perfect square number), but sometimes it is a rational number, as in the square root of 25 (which is a perfect square number).
The number 3 is the square root of the number 9 !
The square root of 16 is 4 which is a whole number.
square-root of 68 times square-root of 68 = 68 (square-root of any number) squared is that number
The square root of 40 is an irrational number