Using the prime factorization, we have:
256 I 2 (Dividing by 2 as the number is even)
128 I 2 (Dividing by 2 as the number is even)
64 I 2 (Dividing by 2 as the number is even)
32 I 2 (Dividing by 2 as the number is even)
16 I 2 (Dividing by 2 as the number is even)
8 I 2 (Dividing by 2 as the number is even)
4 I 2 (Dividing by 2 as the number is even)
2 I 2 (Dividing by 2 as the number is even)
1
We see that we can rewrite 256 as 2^8