#### Answer

$2\times3\times3\times3$

#### Work Step by Step

First, we divide 54 by the prime number 2. This results in the number 27, which is equal to $3^{3}$, or $3\times3\times3$. 3 is also a prime factor. Therefore, as a product of prime factors, 54 can be written as:
$54=2\times27=2\times3\times3\times3$