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Any number that has only two factors which are itself and one is a prime number.
The prime factorization of 72 is 2 x 2 x 2 x 3 x 3 The prime factors of 72 are 2 and 3. Prime factorizations may contain repeated factors. When you list the factors, you only need to list them once.
The list of prime numbers is infinite. There are two factors for each.
To find the prime and composite factors of a number, you can list the factor pairs. 92: 1 x 92 2 x 46 4 x 23 The prime factors are 2, 23. The composite factors are 4, 46, 92.
There is not such a thing as a composite prime number. A prime number has exactly two factors. A composite number has more than two factors.