Question

Marla says that every number in nineties is composite. Jackie says that one number in the nineties is prime. Who is correct?

Answer 1

Jackie. 97 is a prime number, not a composite.

Answer 2

Jackie, 91, 97 is prime.

Explanation:

Remember that a number greater than 2 is NOT prime if it is divided by any number different than 1, for example 6 is NOT prime because 3 divides 6. 7 is prime because the only divisors of 7 are 1 and 7.

So for the nineties 90 is divisible by 45.

91 is divisible by 7

92 is divisible by 2

93 is divisible by 3

94 is divisible by 2

95 is divisible by 5

96 is divisible by 2

97 IS PRIME, is just divisible by 1 and 97

98 is divisible by 2

99 is divisible by 3