Q: Is 855,821 a Prime Number?
A: Yes, 855,821 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 855821 can be evenly divided by 1 and 855,821, with no remainder.
Since 855,821 can be divided by just 1 and 855,821, it is a prime number.