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prime number

noun, Mathematics
a positive integer that is not divisible without remainder by any integer except itself and 1, with 1 often excluded:
The integers 2, 3, 5, and 7 are prime numbers.
Also called prime.
Origin of prime number
1585-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for prime number
  • It is no coincidence that the span of each brood's cycle is a prime number of years.
  • Especially because his age was no longer a prime number.
British Dictionary definitions for prime number

prime number

an integer that cannot be factorized into other integers but is only divisible by itself or 1, such as 2, 3, 5, 7, and 11 Sometimes shortened to prime Compare composite number
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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prime number in Science
prime number  
A positive integer greater than 1 that can only be divided by itself and 1 without leaving a remainder. Examples of prime numbers are 7, 23, and 67. Compare composite number.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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prime number in Culture

prime number definition

A number that cannot be divided evenly by any other number except itself and the number one; 1, 3, 5, 7, and 11 are prime numbers.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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