Q: Is 400,078 a Prime Number?
A: No, 400,078 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 400078 can be evenly divided by 1 2 7 14 17 34 41 82 119 238 287 574 697 1,394 1,681 3,362 4,879 9,758 11,767 23,534 28,577 57,154 200,039 and 400,078, with no remainder.
Since 400,078 cannot be divided by just 1 and 400,078, it is not a prime number.