Skip to main content
Select Source:

prime number

prime number Positive or negative integer, excluding one and zero, that has no factors other than itself or one. Examples are 2, 3, 5, 7, 11, 13, and 17. The integers 4, 6, 8, … are not prime numbers since they can be expressed as the product of two or more primes.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"prime number." World Encyclopedia. . Encyclopedia.com. 21 Jul. 2017 <http://www.encyclopedia.com>.

"prime number." World Encyclopedia. . Encyclopedia.com. (July 21, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/prime-number

"prime number." World Encyclopedia. . Retrieved July 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/prime-number

prime numbers

prime numbers These are whole numbers that have only two factors ― the number itself and the number one. The only even prime number is two: all other prime numbers are odd. These are the prime numbers below 100.

2

3

5

7

11

13

17

19

23

29

31

37

41

43

47

53

59

61

67

71

73

79

83

89

97


Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"prime numbers." World Encyclopedia. . Encyclopedia.com. 21 Jul. 2017 <http://www.encyclopedia.com>.

"prime numbers." World Encyclopedia. . Encyclopedia.com. (July 21, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/prime-numbers

"prime numbers." World Encyclopedia. . Retrieved July 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/prime-numbers

prime number

prime number: see number theory.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"prime number." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 21 Jul. 2017 <http://www.encyclopedia.com>.

"prime number." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (July 21, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/prime-number

"prime number." The Columbia Encyclopedia, 6th ed.. . Retrieved July 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/prime-number