What Are Prime and Composite Numbers?

1. What is a Prime Number?

A prime number is a special kind of number that can only be divided by 1 and itself. This means it has exactly two different factors. For example:

• 2 can only be divided by 1 and 2 (its factors are 1 and 2).
• 3 can only be divided by 1 and 3 (its factors are 1 and 3).
• 5 is also a prime number (factors are 1 and 5).

Some prime numbers are: 2, 3, 5, 7, 11, and 13.

2. What is a Composite Number?

A composite number, on the other hand, has more than two factors. This means it can be divided by 1, itself, and at least one other number. For example:

• 4 has factors of 1, 2, and 4.
• 6 has factors of 1, 2, 3, and 6.
• 8 has factors of 1, 2, 4, and 8.

Some composite numbers are: 4, 6, 8, 9, and 10.

3. Is 1 a Prime or Composite Number?

The number 1 is neither prime nor composite. It only has one factor, which is itself.

4. Quick Review:

To remember:

• Prime Numbers: Have exactly 2 factors (1 and the number itself).
• Composite Numbers: Have more than 2 factors.

5. Fun Fact:

The number 2 is the only even prime number! All other even numbers are composite because they can be divided by 2.

Now you know the difference between prime and composite numbers! Keep practicing, and you'll become a numbers expert!