Prime Numbers

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What is a prime number? John's definition:  a whole number that has EXACTLY TWO factors, one (1) and the number itself. Another definition: an integer that can only be divided by 1, -1, the number itself, and it's inverse.

* Definitions from reference books and math textbooks. * One is the Loneliest Number (one is not a prime number) * Prime Number Flash Cards (this page is under development) * Do Negative Prime Numbers Exist? * Five Prime Number Puzzles summary page Smallest number of positive prime numbers that add up to 1000 Shortest list of different positive prime numbers that add up to 135 Largest number of positive prime addends that add up to 1000 Longest list of different positive prime numbers that add up to 1000 Largest number of different prime addends that add up to 1000 (negative primes allowed)

Are 2, 3, 5 and 7 prime numbers? yes: 2 is prime. The factors are 1 and 2. yes: 3 is prime. The factors are 1 and 3. yes: 5 is prime. The factors are 1 and 5. yes: 7 is prime. The factors are 1 and 7. Are 1, 4, 6, 8 and 0 prime? no: 1 is not prime. 1 is the only factor. no: 4 is not prime. The factors are 1, 2 and 4. no: 6 is not prime. The factors are 1, 2, 3 & 6. no: 8 is not prime. The factors are 1, 2, 4 & 8. no: 0 is not prime. It either has NO factors or infinitely many factors. Take your pick. Either way, it isn't prime.