Three is the second smallest prime number, the next is five.
3 goes into 9 exactly 3 times, so fractions with 3 in the denominator have a single digit repeating sequences in their decimal expansions. A natural number is divisible by three if and only if its decimal digit sum is divisible by 3.
Many human cultures have given the concept of threeness symbolic meanings:
Three (三 pinyin san1) is considered a good number in Chinese culture because it sounds like the word "alive" (生 pinyin sheng1), compare to four.
Three is also:
Decals and bumper stickers bearing the phrase "In Memory of 3" are references to NASCAR driver Dale Earnhardt.
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