## Lesson goal: Divisibility Rules

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In a past lesson you used the % (or mod) operator to test numbers for divisibility. The mod operator makes this easy, since if it's zero, it means a number divided into another with no remainder. And, no remainder means the original number is divisibile by the number being tested for divisibility.

Let's look again at divisibility using Prolog. This approach will allow us to think more about the logic of divisibility, rather than just blindly using the power of the % operator.

For this, we'll use Wikipedia's article on divisibility. This lesson is about seeing if we can adapt the rules found here directly into Prolog.
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