Prime factors are factors of a number that are, themselves, prime numbers.

Sometimes you might be asked to write a number as the product of its prime factors.

There are many methods to find the prime factors of a number, but one of the most common is to use a **prime factor tree**:

- Start the factor tree using any pair of factors (two numbers that multiply together to make your number).
- If one of these factors is prime, that branch ends.
- If a factor isn't prime, divide it into a factor pair.
- The branches continue to expand until all the factors are prime numbers.
- The
**final answer**is the list of**all the prime numbers**displayed at the end of these branches.

Note that the number \({1}\) is not used within a factor tree.

**Write 24 as the product of its prime factors.**