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The square root of 81 is 9 which is a rational number

Q: Is the square of 81 a rational number?

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Yes, the square of any rational number is also a rational number.The square root of 2 is not a rational number.

No. Though every perfect square is a rational number, not every rational number is a perfect square. Example: 2 is a rational number but sqrt(2) is not rational, so 2 is not a perfect square.

Yes, it is.

No, and I can prove it: -- The product of two rational numbers is always a rational number. -- If the two numbers happen to be the same number, then it's the square root of their product. -- Remember ... the product of two rational numbers is always a rational number. -- So the square of a rational number is always a rational number. -- So the square root of an irrational number can't be a rational number (because its square would be rational etc.).

It is the square of the rational number.

Related questions

n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.

Yes. The square root of 81 is 9, which is a rational number.

No. The square root of 81 is 9, which is a rational number.

Yes. The square root of 81 is 9 - a natural number and all natural numbers are rational numbers.

Yes and it is also a square number because 9*9 = 81

No because the square root of 81 is 9 which is a rational number

Yes. 81 is a:- Real number - Rational number - Integer - Natural number - Counting number - Square number - Odd number

Integer, rational, and real.

Yes. It's +9 and -9. They're both rational.

No. The square root of 81/(-3) is rational. The square root of [81/(-3)] is imaginary (a kind of complex number).

No. 81 is a rational number. An irrational number is a number with an endless amount of digits like pi or the square root of 2.

Since it is the square root of a negative number, it is actually imaginary, neither rational nor irrational. It is equal to 9i, or 9 times whatever the square root of negative one is.square root of -81 = square root of 81 times i = 9i