Question

put a check by all the prime numbers.
your answer
2
8
15
16
22
25
none of the above

Explanation:

Step1: Recall prime number definition

A prime number has only two distinct positive divisors: 1 and itself.

Step2: Analyze 2

The number 2 has divisors 1 and 2 only. So it is prime.

Step3: Analyze 8

$8 = 2\times4$, so it has divisors 1, 2, 4, 8. It is not prime.

Step4: Analyze 15

$15=3\times 5$, so it has divisors 1, 3, 5, 15. It is not prime.

Step5: Analyze 16

$16 = 2\times8=4\times4$, so it has divisors 1, 2, 4, 8, 16. It is not prime.

Step6: Analyze 22

$22=2\times11$, so it has divisors 1, 2, 11, 22. It is not prime.

Step7: Analyze 25

$25 = 5\times5$, so it has divisors 1, 5, 25. It is not prime.

Answer:

2