Answer
composite;
$3^{2} \cdot 7$
Work Step by Step
RECALL:
A prime number is a number whose only factors are 1 and itself.
A composite number is a number with factors other than one and itself.
Note that:
$9(7) = 63$
This means that $63$ has 7 and 9 as its factors.
Thus, $63$ is a composite number.
Factor $63$ completely to have:
$63
\\=3(21)
\\=3(3)(7)$
$\\=(3^{2})(7)$
The prime factorization of $63$ is:
$=3^{2} \cdot 7$
