3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number.

Three is the first odd prime number, and the second smallest prime. It is both the first Fermat prime (2 2º + 1) and the first Mersenne prime (2² - 1), as well as the first lucky prime.

Definition of three number in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Feb 5, 2026 · Explore the hidden properties of 3, an odd prime number. Includes Prime Factorization, Divisors, Bases and Fun Facts for students, number lovers and curious minds.

Apr 29, 2026 · The meaning of THREE is a number that is one more than 2. How to use three in a sentence.

Mar 21, 2026 · Learn about this topic in these articles: The number 3 is a very mystical and spiritual number featured in many folktales (three wishes, three guesses, three little pigs, three bears, three …

THREE definition: a cardinal number, 2 plus 1. See examples of three used in a sentence.

4 days ago · 3 is the only integer which is the sum of the preceding positive integers (1+2=3) and the only number which is the sum of the factorials of the preceding positive integers (1!+2!=3).

Definition of 3 in the Definitions.net dictionary. Meaning of 3. What does 3 mean? Information and translations of 3 in the most comprehensive dictionary definitions resource on the web.

Define three. three synonyms, three pronunciation, three translation, English dictionary definition of three. n. 1. The cardinal number equal to 2 + 1. 2. The third in a set or sequence. 3. Something …