The number 2 is the second natural number, after 1. Each natural number, including 2, is constructed by succession, that is, by adding 1 to the previous natural number.2 is the smallest and the only even prime number, and the first Ramanujan prime.It is also the first superior highly composite number,and the first colossally abundant number. An integer is determined to be even if it is divisible by two. When written in base 10, all multiples of 2 will end in 0, 2, 4, 6, or 8; more generally, in any even base, even numbers will end with an even digit. A digon is a polygon with two sides (or edges) and two vertices.: 52 Two distinct points in a plane are always sufficient to define a unique line in a nontrivial Euclidean space. A set that is a field has a minimum of two elements. Binary is a number system with a base of two, it is used extensively in computing.
