Find the Prime Factorization 168

$168$

$168$ has factors of $2$ and $84$ .

$2 \cdot 84$

$84$ has factors of $2$ and $42$ .

$2 \cdot 2 \cdot 42$

$42$ has factors of $2$ and $21$ .

$2 \cdot 2 \cdot 2 \cdot 21$

$21$ has factors of $3$ and $7$ .

$2 \cdot 2 \cdot 2 \cdot 3 \cdot 7$