Q: Is 400,406 a Prime Number?
A: No, 400,406 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 400406 can be evenly divided by 1 2 19 38 41 82 257 514 779 1,558 4,883 9,766 10,537 21,074 200,203 and 400,406, with no remainder.
Since 400,406 cannot be divided by just 1 and 400,406, it is not a prime number.