Your guide to the number 1, an odd number which is uniquely neither prime nor composite. Mathematical info, prime factorization, fun facts and numerical data for STEM, education and fun. 1 (one, unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers. The number 1 symbolized unity and the origin of all things, since all other numbers can be created from 1 by adding enough copies of it. For example, 7 = 1 + 1 + 1 + 1 + 1 + 1 + 1.

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