Question

The number ▲ is a multiple of 4.

How do you know that a number
that is 20 greater (A+20) is not
a prime number?

Answer 1

It is not a prime number.

Explanation:

Any even number besides 2 cannot be a prime number. If it is a multiple of 4, it will always be even, meaning it absolutely cannot be a prime number.

(Pretty sure this is what was being asked, if not, let me know)