Top Answer

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

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no

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

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.

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

There is no such number.

No because it is 2 times the square root of 21 which is an irrational numberThe square root of 84 is not a rational number

21

Yes, albeit an irrational number

No, 441 is though (it is 21 squared)

irrational

21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.

your answer is 3 147 * 3 = 441 21 * 21 = 441

The answer is 21. 21 X 21=441 and that's between 400 and 450

They are: 25-4 = 21

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

-19

21

21 is a composite number because it has at least one positive factor other than one or itself.

the square of 21 is 441

36 is both a square number and a triangle number as it is:6x6=36andthe square numbers are:1, 3, 6, 10, 15, 21, 28, 36, 45,55, 66, 78.xx

36 is the only square number that is also a triangular number between 20 and 40.

25 and 4 or 121 and 100