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No. The square root of 84 is an irrational number
The square roots of 84 are irrational.
84 is not the square of an integer, its square root, rounded to five decimal places, is ±9.16515.
√84 is irrational.
No. The sq root of 84 is 9.16555515139. 81 is a perfect square, where the sq root is 9.