To find out if 128 is a prime number, we went through our prime number check list. Everything on our prime number check list must be true for 128 to be a prime number.
For 128 to be a prime number, it must be an integer and a positive number: True
For 128 to be a prime number, it must be a number greater than 1: True
For 128 to be a prime number, it must be the number 2 or an odd number greater than 2: False
For 128 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 128 a prime number?" is as follows:
NO: 128 is not a prime number.
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Is 129 a prime number?
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