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. [citation …

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.

The number 3 is a very mystical and spiritual number featured in many folktales (three wishes, three guesses, three little pigs, three bears, three billy goats gruff).

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

Explore the curious properties of number 3, an odd number which is prime. Includes mathematical info, prime factorization, divisors, bases and much more! A fascinating reference for students, …

Dec 22, 2025 · 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 …

The number 3 is a natural number following 2 and preceding 4. It is an odd and prime number, often symbolically significant across different religions and cultures.