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.

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.

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

3 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).

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

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

Properties of the number 3: factors, prime check, fibonacci check, bell number check, binary, octal, hexadecimal representations and more.

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 …