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A prime number is a number that's only factors are 1 and itself.
It cannot be a product of a natural number other than 1 and itself.

For example, 7.
You can get 7 by
1 x 7, nothing else

The opposite is composite number.
For example, 20
1 x 20
2 x 10
4 x 5

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A prime number is a number that 1 factors are multiplied. The prime numbers are 3, 5, 7,13, and 19

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A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number.
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