x is a placeholder for a number. Depending what number you decide that x should be, it will be a Prime number, or it won't.
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The prime factorization of a composite number is a string of prime numbers. 2 x 3 x 5 = 30
No, it is not a prime number. Prime factorization of 100000001 = 17 x 5882353
2457 is a composite number, not a prime. Its factors are 3 x 3 x 3 x 7 x 13.
2 x 3 x 3 = 18
3 is a prime number. 13 is a prime number. 3 x 13 cannot be prime.