What is the method to verify whether a number is a prime number or not ?

What is the method to verify whether a number is a prime number or not ?
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Answer :

First you have to divide the number by 2. If the result is a whole number then the number is not a prime number. If the result is not an integer, then the number must be divided by the prime numbers 3 , 5 , 6 , 11, etc., respectively. If the result is not a whole number then the number is a prime number.
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