Q: Is 20,665 a Prime Number?
A: No, 20,665 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 20665 can be evenly divided by 1 5 4,133 and 20,665, with no remainder.
Since 20,665 cannot be divided by just 1 and 20,665, it is not a prime number.