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Earn +20 ptsQ: Is number 21 a square number?
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Is 21 a square number?
21 is not the square of an integer. The closest square number is 25.
Is 21 a square number itself?
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.
What are the square root of 21?
The square roots of 21 are 4.5826 (rounded) and the negative of the same number.
Is the square root of 21 a real number?
Yes, albeit an irrational number
Is the square root of 21 an irrational or a rational number?
irrational
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