Question

Tell which number is prime: 19, 28, 49, 63.

Answer 1

The number 19 is the prime number.

Explanation:

Consider the provided number.

Prime number: A prime number is a whole number which is greater than 1 and the factors of the number are 1 and itself.

The prime factorization of the provided numbers are:

19 = 1×19

28 = 2×2×7

49 = 7×7

63 =7×9

Here 19 is the only number having factors 1 and 19 which is itself.

Hence, the number 19 is the prime number.

Answer 2

19 is prime: 19 x 1 = 19
28 is not prime: 7 x 4 = 28
49 is not prime: 7 x 7 = 49
63 is not prime: 3 x 21 = 63

hope this helps