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**Prime numbers**are whole numbers that have 2 factors: only 1 and itself.

Examples:

·

**2**- 1 x 2 (2 factors)

·

**3**- 1 x 3 (2 factors)

·

**23**- 1 x 23 (2 factors)

On the other hand,

**composite numbers**are whole numbers that consist of more than 2 factors.

Examples:

·

**4**- 1 x 4, 2 x 2 (4 factors)

·

**6**- 1 x 6, 2 x 3 (4 factors)

·

**100**- 1 x 100, 2 x 50, 4 x 25, 5 x 20, 10 x 10 (9 factors)

__Question:__

List down all the factors of 15 first so that we'll figure out if it's a prime number.

It has 4 factors. Does it mean that it's a prime number?

NO, because as I've said earlier, prime numbers have only 2 factors but it's stated above that 15 has 4 factors.

__Is 15 a prime number?__List down all the factors of 15 first so that we'll figure out if it's a prime number.

**15**= 1 x 15, 3 x 5 (4 factors)It has 4 factors. Does it mean that it's a prime number?

NO, because as I've said earlier, prime numbers have only 2 factors but it's stated above that 15 has 4 factors.

**15 is a composite number.**

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*Have a wondrous day =)*

**TRIVIA:**

**Do you know that Prime numbers and odd numbers are different.**