Tell which number is prime: 19, 28, 49, 63.
A.63***
B.49
C.28
D.19
is 19!
The answer is 19
19
the answer is 9
here is a tip
The 30 prime numbers are. 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101. 103. 107, 109, 113, 117 and their sum is 230.