- Must be a whole number: It cannot be a fraction or a decimal (like 2.5).
- Must be greater than 1: The number 1 is not considered prime.
- The "Two-Factor" Rule: It can only be divided evenly by 1 and itself.
- No other "Building Blocks": You cannot multiply any other two smaller numbers other than 1 and itself together to create it.
- 2 is the only even prime number.
Bonus rule:
- Two primes separate by a gap of 2 (eg. 11 and 13) are twin primes.
- View The Gap - 2 Function here.
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