The number one is only multiplied by itself.
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a prime number
1 is not a prime number because it can be evenly divided by itself and by 1, the opposite as per the definition of a prime number.
If you mean what do you call a number with only 1 and itself as factors, then it is a prime number.
A composite number.
Because a prime number has two factors whereas 1 has only one factor which is itself