That describes a Prime number.
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It is 1 because it only has itself as a factor.
If you mean what do you call a number with only 1 and itself as factors, then it is a prime number.
1, considering the only factors of 1 is itself.
The positive integer with only one factor is 1.
prime * * * * * No, the only number with just one factor is 1. Each prime has TWO factors: 1 and the prime itself.