Is 81 a prime number?
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To find out if 81 is a prime number, we went through our prime number check list. Everything on our
prime number check list must be true for 81 to be a prime number. For 81 to be a prime number, it must be an integer and a positive number: True For 81 to be a prime number, it must be a number greater than 1: True For 81 to be a prime number, it must be the number 2 or an odd number greater than 2: True For 81 to be a prime number, it must only be divisible by 1 and itself: False All of our tests above did not prove true, therefore the answer to the question: "Is 81 a prime number?" is as follows: NO: 81 is NOT a prime number. Using the knowledge you learned above to figure out if 81 is a prime number, do you know the answer to: Is 82 a prime number? 
