21 is not the square of an integer. The closest square number is 25.
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No, 21 is not a square number. A square number is the result of multiplying an integer by itself, and 21 cannot be expressed as the square of an integer.
no
The square roots of 21 are 4.5826 (rounded) and the negative of the same number.
Yes, albeit an irrational number
irrational