Definition:Odd Prime

Definition

Every even integer is divisible by $2$ (because this is the definition of even).

Therefore, apart from $2$ itself, all primes are odd.

So, referring to an odd prime is a convenient way of specifying that a number is a prime number, but not equal to $2$.

Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $2$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $2$
• 2008: Ian Stewart: Taming the Infinite ... (previous) ... (next): Chapter $7$: Patterns in Numbers: Primes