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No - because it can be represented as a ratio of integers :

81 = 81/1

Any number that can be represented as a ratio of 2 integers is classified as a rational number (other than that you can't use 0 for the denominator)

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Q: Is the number 81 irrational

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

81 as well as all whole numbers are rational numbers. Any number that can be written as a fraction is a rational number. An irrational number can be written as a decimal, but not as a fraction. An irrational number has endless non-repeating digits to the right of the decimal point. An example of an irrational number would be pi: π = 3.141592…

The sum of a rational and irrational number must be an irrational number.

rational * irrational = irrational.

No, 3.56 is not an irrational number. 3.56 is rational.

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No, -81 is not an irrational number because it can be represented in the form x/y = -81

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.

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

No.

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

81 as well as all whole numbers are rational numbers. Any number that can be written as a fraction is a rational number. An irrational number can be written as a decimal, but not as a fraction. An irrational number has endless non-repeating digits to the right of the decimal point. An example of an irrational number would be pi: π = 3.141592…

81*81 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.

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

no. it is 9

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

An irrational number.

No, it is rational.

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