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It is a composite number, you can get 81 by mulitpling 1*81, 3*27, and 9*9.
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No the number 81 is not prime it can be divided by nine.
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2017-02-19 03:28:22
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2010-03-19 14:56:38

81 is a composite number because it has factors other than 1 and itself. 81 is not a Prime number.

81 = 3 * 3 * 3 * 3. Its positive integer factors are: 1, 3, 9, 27, 81.

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2012-05-09 01:00:43

81 is a composite number because it has more factors than 1 and itself. The factors of 81 are 1, 3, 9, 27, and 81.

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2012-10-17 07:09:01

81 = 92 = 34

So 81 is not prime

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2016-11-24 13:59:25

It is composite.

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2016-11-24 14:54:16

It is composite.

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2017-02-14 03:35:58

composite

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2017-02-05 03:32:31

composite

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Q: Is 81 a prime number or a composite number?
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