#### Answer

$2^{2}\times17$

#### Work Step by Step

In order to find the prime factorization of 68, we can try to divide 68 by the first prime, 2.
$68\div2=34$
Try to divide 34 by 2.
$34\div2=17$
17 itself is a prime number, so we cannot simplify any more. The prime factorization of 68 is $2\times2\times2\times17=2^{2}\times17$.