2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number. Because it forms the basis of a duality, it has religious and spiritual significance in many cultures.
A West Arabic numeral, ultimately from Indic numerals (compare Devanagari २ (2)), from a cursive form of two lines to represent the number two. See 2 § Evolution for more.
Your guide to the number 2, the only even prime number. Mathematical info, prime factorization, fun facts and numerical data for STEM, education and fun.
The square root of 2 (approximately 1.4142) is the positive real number that, when multiplied by itself or squared, equals the number 2. It may be written as or . It is an algebraic number, and therefore not a transcendental number. Technically, it should be called the principal square root of 2, to distinguish it from the negative number with the same property. Geometrically, the square root ...