Q: Is 400,809 a Prime Number?
A: No, 400,809 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 400809 can be evenly divided by 1 3 17 29 51 87 271 493 813 1,479 4,607 7,859 13,821 23,577 133,603 and 400,809, with no remainder.
Since 400,809 cannot be divided by just 1 and 400,809, it is not a prime number.