Prime factorization of $$$158$$$

Find the prime factorization of $$$158$$$.

Start with the number $$$2$$$.

Determine whether $$$158$$$ is divisible by $$$2$$$.

It is divisible, thus, divide $$$158$$$ by $$${\color{green}2}$$$: $$$\frac{158}{2} = {\color{red}79}$$$.

The prime number $$${\color{green}79}$$$ has no other factors then $$$1$$$ and $$${\color{green}79}$$$: $$$\frac{79}{79} = {\color{red}1}$$$.

Since we have obtained $$$1$$$, we are done.

Now, just count the number of occurences of the divisors (green numbers), and write down the prime factorization: $$$158 = 2 \cdot 79$$$.

The prime factorization is $$$158 = 2 \cdot 79$$$A.