How to find whether a number is prime or not formula number system
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Some facts:
- The only even prime number is 2. ...
- If the sum of a number's digits is a multiple of 3, that number can be divided by 3.
- No prime number greater than 5 ends in a 5. ...
- Zero and 1 are not considered prime numbers.
- Except for 0 and 1, a number is either a prime number or a composite number.
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