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Is 1 a prime number?

  1. Feb 1, 2004 #1
    I've heard ppl say it is and it isn't, so is it a prime number? :P
  2. jcsd
  3. Feb 1, 2004 #2


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  4. Feb 1, 2004 #3
    yeah, I was kind of leaning towards that it's not a prime number, thanks for confirming :)
  5. Feb 2, 2004 #4


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    Excluding 1 from the definition of prime number makes it easier to state many theorems in number theory.

    For example, every integer can be factored uniquely into a product of (unique) powers of primes. If 1 was called a prime, its exponent could be anything.
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