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# Is the square root of 21 a rational number?

Updated: 4/28/2022

Wiki User

12y ago

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

Wiki User

12y ago

Anonymous

Lvl 1
4y ago

Irrational number

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Q: Is the square root of 21 a rational number?
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### Is the square root of 84 a rational 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

### Is the square root of 441 a rational number?

Yes because 21 is a rational number

irrational

### Is the square root of 21 rational?

No, they are not.

### Is 21 over the square root of 4 a rational or irrational?

It is equal to 21/2 which is a rational number

### The square root of 21 is it rational or irrational?

irrational, it has a never ending decimal

### What is the simplest radical from of the square root of 84?

First note that 84=4x21 and 4 is a perfect square. So square root of (84)=square root (4x21)=Square root (4) Square root (21)= 2 multiplied by the square root of 21. You can also write this using rational exponents, but this is not in radical form. It is an equivalent expression, however. 2 x (21)1/2

### What is the square root of 21?

The square root of 21 is 4.58257569495584.

### What are the square root of 21?

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

### What is the square root of 84 simplify?

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

### What is an Adams 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....................

### Is 21 a rational or irrational number?

21 is a rational number.