Q: Is 400,015 a Prime Number?
A: No, 400,015 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 400015 can be evenly divided by 1 5 7 11 35 55 77 385 1,039 5,195 7,273 11,429 36,365 57,145 80,003 and 400,015, with no remainder.
Since 400,015 cannot be divided by just 1 and 400,015, it is not a prime number.