Q: Is 20,409 a Prime Number?
A: No, 20,409 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 20409 can be evenly divided by 1 3 6,803 and 20,409, with no remainder.
Since 20,409 cannot be divided by just 1 and 20,409, it is not a prime number.