PRIME AND COMPOSITE NUMBERS

A prime number is a whole number that has exactly two factors: itself and 1.
Example: 7 is a prime number because the only factors of 7 are 1 and 7.

A composite number is a whole number that has more than two factors.
Example: 12 is a composite number because it has 6 factors: 1,2,3,4,6, and 12.

COOL LINKS:

Prime and Composite Numbers - After reading the description, test your knowledge!

Prime and Composite Numbers - Another good description with examples!

Prime Factorization Chart - Test your knowledge! Determine if the numbers listed are prime numbers!

World's Largest Known Prime Number - Find out what it is and who discovered it!

Test your knowledge! - Determine whether a number is prime or composite.

Prime and Composite Practice - Another practice activity!