Q: How many square roots does a number 20 have?

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16 is an even number from 10 to 20, and its square roots are -4 and +4.

20

20 is one of the two square roots of 400.

Prime numbers can't have whole number square roots, of course, but the largest prime number under 400 is 397.

No, a square root doesn't have to be a whole number. The square root of 2.25 is 1.5. It could be said that most square roots are not whole numbers. Take just the first few integers (counting numbers). Find the square roots of the numbers 1 through 10 and you'll find three of the numbers have whole number square roots (1, 4 and 9). The other seven don't. For the numbers 11 through 20, there is only 1 number with a whole number square root (16).

Related questions

16 is an even number from 10 to 20, and its square roots are -4 and +4.

20

Two, a positive and a negative.

The two square roots of 400 are: 20 and -20.

20 and -20

20 is one of the two square roots of 400.

20. * * * * * Sort of. ± 20 are the square roots (not rout!) of 400.

They are -20 and +20.

Prime numbers can't have whole number square roots, of course, but the largest prime number under 400 is 397.

-20 20

No, a square root doesn't have to be a whole number. The square root of 2.25 is 1.5. It could be said that most square roots are not whole numbers. Take just the first few integers (counting numbers). Find the square roots of the numbers 1 through 10 and you'll find three of the numbers have whole number square roots (1, 4 and 9). The other seven don't. For the numbers 11 through 20, there is only 1 number with a whole number square root (16).

All of the integers between 20 and 30 are square roots.