23
Prime numbers are odd numbers and 21=3x7
20 is the next number greater than 19. The next prime number greater than 19 is 23.
19 is the prime number.
19 is a prime number
19 is prime.
19 is a prime number.
20 is the next number greater than 19. The next prime number greater than 19 is 23.
19 is a prime.
19 is a prime number, so it has no prime factorization.
19 is a prime number.19 is a prime number.19 is a prime number.19 is a prime number.
19 is the prime number.
19 is a prime number.
19 is a prime number
19 is prime.
19 is a prime number.
19 is a prime number.
19 is a prime number
19 is a prime number, but it is not a factor of 200.