2 (two) is a number, numeral, and glyph. It is the natural number following 1 and preceding 3.
In mathematics
Two has many properties in mathematics.Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 41?44 An integer is called even if it is divisible by 2. For integers written in a numeral system based on an even number, such as decimal and hexadecimal, divisibility by 2 is easily tested by merely looking at the one's place digit. If it's even, then the whole number is even. In particular, when written in the decimal system, all multiples of 2 will end in 0, 2, 4, 6, or 8.Two is the smallest and the first prime number, and the only even one (for this reason it is sometimes humorously called "the oddest prime"). The next prime is three. 2 is the first Sophie Germain prime, the first factorial prime, the first Lucas prime, and the first Smarandache-Wellin prime. It is an Eisenstein prime with no imaginary part and real part of the form 3n
Source:
http://en.wikipedia.org/wiki/Two