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because Prime number is a number that can only be divided by 1. cuz 1 is itself it is just crossing the border line.

Comments: That's a good question.

The number "one" seems too fit the basic definition of a prime number.

It's only divisible by 1 and itself (1 again).

There are various explanations, but the simplest reason is that "one" is just defined as not being a prime number.

Mathematicians do that sort of thing sometimes, for reasons which seem obscure to "ordinary" people.

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10y ago
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Q: Why is one not the smallest Prime Number?
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