Q: Is 400,518 a Prime Number?
A: No, 400,518 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 400518 can be evenly divided by 1 2 3 6 9 18 27 54 7,417 14,834 22,251 44,502 66,753 133,506 200,259 and 400,518, with no remainder.
Since 400,518 cannot be divided by just 1 and 400,518, it is not a prime number.