write 256 as a product of prime factors
256 -> 4 -> 2 & 2 -> 64 -> 8 & 88 -> 4 & 24 -> 2 & 28 -> 4 & 24 -> 2 & 2(I hope this format makes sense) So you are left with 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 or \(2^{8}\). I hope this helps!
