Q: Is 209,865 a Prime Number?
A: No, 209,865 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 209865 can be evenly divided by 1 3 5 15 17 51 85 255 823 2,469 4,115 12,345 13,991 41,973 69,955 and 209,865, with no remainder.
Since 209,865 cannot be divided by just 1 and 209,865, it is not a prime number.