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The number 2 is a natural number that follows 1 and precedes 3. It is the smallest and the only even prime number. In mathematics, it is significant as the basis of the binary number system used extensively in computing. The digit 2 evolved from the Indic Brahmic script and has various cultural and scientific meanings. In everyday language, "two" is used as a determiner with plural countable nouns or as a noun referring to the number itself. It is also notable as the first Ramanujan prime, the first superior highly composite number, and the first colossally abundant number.