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Why isn't 1 considered a prime number?

It can only be divided by itself and 1, after all.

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Michael Scalise

Lvl 12
3y ago
Updated: 12/15/2022

1 can only be divided by one number, 1 itself, so with this definition 1 is not a Prime number. It is important to remember that mathematical definitions develop and evolve. Throughout history, many mathematicians considered 1 to be a prime number although that is not now a commonly held view.

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