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Two (2) is a number that is significant for being the first and smallest prime number, and the only even one.

A number is called even if it is divisible by 2. In the decimal system, all such numbers have an 0, 2, 4, or 8 as their final digit.

2 is a very highly occurring number in human culture, because of the frequency of pairs and dichotomies. In particular:

  • 2 is the number of genders in human beings and many other Earth species
  • 2 is the number of people in a standard romantic relationship
  • A common theme in works of fiction involves 2 individuals or groups in conflict, often "good" versus "evil"
  • Sports and games often pit 2 teams or individuals against each other
  • Parts of the human body often appear in duplicate:
    • 2 ears
    • 2 eyes
    • 2 legs
    • 2 arms
    • 2 lungs
    • 2 halves of the brain
    • Upper and lower jaw
  • A number added to the title of something to indicate that it is a sequel. For example, the sequel to Doom was titled Doom 2.

2 is notable for being the base of the binary numeral system, which some computers are built on.