19 is a prime.
19 is a prime number, so it has no prime factorization.
19 is prime.
19 is already prime.
19 is the prime number.
19 is a prime number.19 is a prime number.19 is a prime number.19 is a prime number.
19 is a prime number, so its prime factorization is 1 x 19 or simply 19.
19 is prime. 1 and 19.
19 is a prime factor.
19 is a prime number.
19 is a prime number
19 is already prime.