Prime or Composite
Prime and composite numbers are number identities. Prime numbers have exactly two factors; composite numbers have more.
Do this: Read the concept below, then try the quiz or activity.
Lesson 1 of 215
Concept
A prime number has exactly two factors: 1 and itself.
Examples: - 2 is prime (factors: 1, 2) - 3 is prime (factors: 1, 3) - 5 is prime
A composite number has more than two factors.
Examples: - 4 is composite (1, 2, 4) - 6 is composite (1, 2, 3, 6) - 12 is composite
Special notes: - 1 is neither prime nor composite. - 2 is the only even prime number.
Try it
Practice: Prime or Composite.