Because they only have one factor pair.
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Prime numbers have only two factors.
Prime numbers are numbers that have only 2 factors, 1 and itself. The number one is not prime or composite. Most prime numbers are odd. There is only one composite even number, 2.
Numbers with only two factors, the number itself and one, are called prime numbers. Examples of prime numbers are 2 (which is the only even prime number) and 17.
Prime numbers only have one and themselves as factors.
Since prime numbers only have one prime factor (themselves), they don't have prime factorizations.