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The definition of a Prime number is a number which has only two factors: 1 and itself. All prime numbers have only two factors: one and themselves. So, asking "What is a prime number that has only 2 factors one and itself" is like asking "What is a type of cocker spaniel that is a dog?"
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How you know that 2 is a prime factor?
2 is a prime number because its only factors are one and itself. Since 2 is a prime number, if it is a factor of your number, it is a prime factor.
Has only itself and 1 as a factor?
a prime number
What is the prime factorization of 7?
7 is a prime number and therefore its only prime factor is itself.7 is already prime. Its only prime factor is itself.
What is the prime factor of 37?
There is no factorization. 37 is a prime number.37 is already prime. Its only prime factor is itself.
What is the prime factor of 5?
5 is a prime number. It is only evenly divisible by itself and one.5 is a prime number, so the only prime factor of 5 is itself.5 is already a prime number; it has no factorization.
