1 because 1 can only be divided by itself. 1x1=1
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One is.
The number ' 1 ' has only one factor.
By definition, all prime numbers have exactly two factors. There is not a prime number that has only one factor.
The number 1 is not a prime number. A prime number has exactly two factors, 1 and the number itself. 1 is the only number having exactly one factor.
A factor is a number or algebraic expression by which another is exactly divisible. A prime number is a positive integer with two factors: one and the number itself.