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One way to explain why the number 1 is neither prime nor composite is that it has only one factor which is itself. Another way to look at it is that you can multiply 1*1*1... an infinite number of times and still get 1.

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Q: Why isn't the number 1 considered prime or composite?
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A number that isnt a prime number?

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1 is neither prime nor composite because Eratosthenes decided that it was nor prime nor composite because 1x1 is 1, but then again,1x any other number is that number, so one can go into every number before and after infinity. Confusing right? Try looking up on Wiki the guy Eratosthenes.


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