The positive integer with only one factor is 1.
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A prime. If you don't consider the number 1 as a factor, the prime has only itself as a factor.
a positive integer evenly divisible only by itself and one.
One is the only integer with one factor.
A prime number is a number with two positive integer factors, while a composite number has more than two positive integer factors. Since the number 0 has no positive integer factors, and the number 1 has just one positive integer factor (itself), neither of these are prime.
A positive integer with only two factors: one and the number itself.
A positive integer with only two factors: one and the number itself.