- 3 is a prime number, being the smallest odd prime, Mersenne prime, Fermat prime, and Cullen prime.
- A number is divisible by 3 if the sum of the digits is.
- It is the 2nd prime, and the 4th term in the Fibonacci Sequence.
- 2 famous constants, pi and e both round to 3.
- 3 is the number of dimensions we live in, excluding time.
Times tables up to 10
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