Yes, all prime numbers have only two factors
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All prime numbers have only two factors, one and themselves.
They all have two unique factors.
They only have two factors.
All composite numbers are not prime numbers because they have more than two factors
All numbers have factors. Some numbers have only two factors, the number one and the number itself. These are known as prime numbers. 7 has two factors: 1 and 7. 7 is a prime number.