This document proves that if n is an odd integer, then n^3 - n is divisible by 8. It first proves in a lemma that the product of two consecutive even integers is divisible by 8. It then shows that if n is odd, n-1 and n+1 are consecutive even integers. Their product is divisible by 8, and since (n-1)(n+1)n = n^3 - n, it follows that n^3 - n is also divisible by 8. However, it notes that this is not true for all integers n, providing a counterexample of n = 6 where 6^3 - 6 is not divisible by 8.