Q: Is 866,003 a Prime Number?
A: Yes, 866,003 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 866003 can be evenly divided by 1 and 866,003, with no remainder.
Since 866,003 can be divided by just 1 and 866,003, it is a prime number.