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if its even, automatically not prime. 0s and 5s are not prime. add the first 3 numbers up, (from the right) and divide them by 8. if it is divisible, it's not prime. 4 is the same thing accept only the first 2 numbers from the right. That's all i can remember from the top of my head, and 6 might be add all of them together and divide, divisible=not prime.

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Q: How do you check if a number is prime?
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