Because a Prime number has two factors whereas 1 has only one factor which is itself
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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.
a prime number
Composite
When a composite number is expressed as the product of its prime factors, we call that the prime factorization.
If you mean what do you call a number with only 1 and itself as factors, then it is a prime number.