3 x 7 x 19 = 399
1, 3, 7, 19, 21, 57, 133, and 399. The prime factors of 399 are 3, 7, and 19.
399 is not prime as it has more than two factors which are 1 and itself as it has many other combinations of numbers to resolve the question so no 399 is not prime
399 is not a prime number because it has more than two factors which can be shown by the prime factorization of 399 i.e. P.F. of 399 = 3x7x19.
3 x 7 x 19 = 399
The factors of 399 are: 1, 3, 7, 19, 21, 57, 133, 399.
1, 3, 5, 7, 15, 19, 21, 35, 57, 95, 105, 133, 285, 399, 665, 1995 3, 5, 7 and 19 are prime.
The prime factorization of 399 is 3 x 7 x 19. 21 wouldn't be included since it isn't a prime number.
399 = 3 * 7 * 19
1, 3, 7, 19, 21, 57, 133, 399
1, 3, 7, 19, 21, 57, 133, 399
The common factors are: 1, 3
Prime factors are factors that are also prime numbers.