1. What are the divisors of 15?

2. What are the divisors of 85?

3. Which number is neither prime nor composite?

4. Which prime number is even?

5. Which is the smallest three-digit prime number?

6. Which is the biggest three-digit prime number?

7. What is the prime factor of 925?

8. What is the GCD of 60, 90?

9. What is the GCD of 105, 154?

10. What is the LCM of 4, 6?

11. What is the LCM of 216, 288, 270?