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Because it has no divisors other than itself and one. That is the definition of a Prime number.
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Why is 31 not a prime number?
31 is a prime number
Is 31 prime or not?
31 is a prime number
What is the prime factorizer of 31?
31 has no prime factors because it is a prime number so it has two factors, 1 and 31.
What is the prime factalization of 31?
31 is a prime number. Its only prime factor is 31.
Is 31 prime or composite number?
31 is prime.
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