Question

which number is prime
A.70
B.49
C.31
D.85

Answer 1

Which number has only two numbers (1 and the number itself)

Answer 2

Which number cannot be divided by any number other than itself or one?

Answer 3

But it's c though 1,31

Answer 4

(Easiest way to get there is to divide by the primes you know. e.g. 2, 3, 5, 7, 11...)