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Definition of Prime Number
a prime number is any number whose only factors are 1 and itself.
Many people ask if the number 1 is a prime number? The answer is no -- 1 is not prime! The reason for this has to do with prime factorization. If 1 were to be considered prime, then it would not be possible to generate unique prime factorizations of numbers.
Examples of prime numbers
- 5 is prime because its only factors are 1 and 5
- 11
 only factors are 1 and 11
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