3（三）是2与4之间的自然数，同时也是奇数、正整数。 是从0开始的第二个质数，3是第三个非零自然数，也是第一个梅森素数。

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.

In basketball, a shot made from behind the three-point arc is worth 3 points. 3 is used to represent the small forward position. A hat-trick in sports is associated with succeeding at anything three …

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).

3 ... 3 （三）是 2 与 4 之间的 自然数，是第2個 質數，亦是一個 正整數。

Three is an important number for many cultures (groups of people living together). It is also a prime number. It is the first odd prime. In Roman numerals, it is III. three gifts of the wise men …

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