What is the formula to check whether a number is prime or not?
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A prime number can be divided, without a remainder, only by itself and by 1. For example, 17 can be divided only by 17 and by 1.
Some facts:
The only even prime number is 2. All other even numbers can be divided by 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. Any number greater than 5 that ends in a 5 can be divided by 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. A composite number is defined as any number, greater than 1, that is not prime.
Some facts:
The only even prime number is 2. All other even numbers can be divided by 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. Any number greater than 5 that ends in a 5 can be divided by 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. A composite number is defined as any number, greater than 1, that is not prime.
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