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5 is the third prime number and the third single-digit prime. 5's prime factors are 1 and 5.

It is also the second Fermat prime. Due to the fact that the previous and next prime are both two numbers away, it is the first balanced prime.

ProofsEdit

  • Yes — 5 can be divided by 1.
  • No — 5 cannot be divided by 2-4.
  • Yes — 5 can be divided by 5.
  • Therefore it has 2 factors.

As an Exponent of Mersenne NumberEdit

25 - 1, which is the number 31, is a prime number. It is the 3rd Mersenne Prime.

Relationship with other numbersEdit

The numbers beforeEdit

  • The previous odd number, 3, is a prime number.
    • There are no odd numbers between 3 and 5. As a result, they are twin primes.
  • 2 is the first prime number. It is the only even prime number.
  • 1, the number before 2, is not a prime number.

The numbers afterEdit

  • The next odd number, 7, is a prime number.
    • There are no odd numbers between 5 and 7. As a result, they are twin primes.
  • 9, the odd number following 7, is a square number. It is the first odd composite number.
  • 11, the odd number following 9, is a prime number.
    • 5 and 11 are six numbers apart, therefore, they are sexy primes.

TriviaEdit

  • 5 is the only number that is part of two twin prime pairs, (3, 5) and (5, 7).

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