A number that has exactly two (positive) factors is called a Prime number. For instance, the only factors of 7 are 1 and 7.
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Prime numbers. Their only two factors are 1 and themselves.
A prime number
The one that is prime.
A prime number is a positive integer that has exactly two different factors: 1 and itself. This is why 1 is not a prime number: it has the factors 1 and itself, but they are the same - it does not have exactly two different factors.
No, a prime number has exactly two factors: 1 and itself.