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21 is not the square of an integer. The closest square number is 25.

Q: Is 21 a square number

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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

Related questions

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

To square a number, you multiply it by itself. In this case, 21 x 21 is 441

sum of 14th square number and 10th square number

The square roots of 21 are 4.5826 (rounded) and the negative of the same number.

If the reverse square root of the reverse of square of a number is the number itself then it is Adam Number. For ex., 12 and 21 Take 12 square of 12 = 144 reverse of square of 12 = 441 square root of the reverse of square of 12 = 21 The reverse square root of the reverse of square of 12 = 12, then number itself. Such number is called Adam Number. cool....................

Square Number: A number that is a product of some integer with itself. Therefore, 21 is not a perfect square. An example of a perfect square is 16, since 4 times 4 is 16.

No. The square root of an integer is either an integer, or an irrational number.

There is no such number.

21

It is: 2 times the square root of 21 and it's an irrational number

Yes, albeit an irrational number