3 is a prime number. 3 is also a Sophie Germain prime because 2 x 3 + 1 = 7, which is a prime.
3 has a unique representation as a sum of three squares: 3 = 12 + 12 + 12.
3 is the number of integer partitions of 3.
3 is the number of integer partitions of 5 into distinct parts.
3 and 5 form a twin prime pair.
Three-dimensional means that something has length, width, and depth.
The letters A F H K N Y Z are all made up of three lines.
The trillium, Ontario's provincial flower, has three petals.
Source: R. Phillips. 1994. Numbers: Facts, Figures and Fiction. Cambridge University Press.
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thanks!!! =D
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