1. What is a number which has only two com- mon factors, 1 and the number itself, called?
2. What is a number which has more than two common factors called?
3. Which number is neither prime nor composite?
4. What are numbers which have only 1 as a common factor called?
5. Which is the only even number that is a prime number?
6. What are the common factors of 12 and 18?
7. What are prime numbers with a difference of two are called?
8. How many pairs of twin prime numbers are between 1 and 100?
9. Who discovered a method to find prime numbers?
10. Who proved that the number of prime numbers is infinite?
Originally posted 2018-01-14 00:57:07.