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Q: Is 21 a square number

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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

No

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.

There is no such number.

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

21

Yes, albeit an irrational number

No, 441 is though (it is 21 squared)

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