Prime Number

Pronunciation: /praɪm ˈnʌm bər/ ?

A prime number is an integer that is evenly divisible only by 1 and itself. An example of a prime number is the integer 5. The only integers that divide evenly into 5 are 1 and 5. If we try to divide 5 by 2, we get 2 1/2, which is not an integer.

A composite number is an integer that is not prime. 6 is not a prime number. 6 is evenly divisible by both 2 and 3, so 6 is a composite number.

More Information

  • Malkevitch, Joseph. Primes. ams.org. American Mathematical Society. 2010-02-06. http://www.ams.org/featurecolumn/archive/primes1.html.
  • McAdams, David. Sieve of Eratosthenes. lifeisastoryproblem.com. Life is a Story Problem LLC. 2009-03-12. http://www.lifeisastoryproblem.com/numbers/sieveeratosthenes.html.

Cite this article as:


Prime Number. 2008-09-03. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/p/primenumber.html.

Translations

Image Credits

Revision History


2008-09-03: Expanded 'More Information' (McAdams, David.)
2007-07-12: Initial version (McAdams, David.)
2007-03-22: Revised See Also to match current standard (McAdams, David.)

All Math Words Encyclopedia is a service of Life is a Story Problem LLC.
Copyright © 2005-2011 Life is a Story Problem LLC. All rights reserved.
Creative Commons License This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License