from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A positive integer not divisible without a remainder by any positive integer other than itself and one.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any natural number greater than 1 divisible only by itself and 1.

from the GNU version of the Collaborative International Dictionary of English

  • adj. a number which is exactly divisible by no number except itself or unity, as 5, 7, 11.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an integer that has no integral factors but itself and 1


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  • Prime numbers are the "atoms" of the number continuum--divisible only by 1 or by themselves. See sieve for a link to see one way they're found.

    February 14, 2007