Q: Is 400,455 a Prime Number?
A: No, 400,455 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 400455 can be evenly divided by 1 3 5 9 11 15 33 45 55 99 165 495 809 2,427 4,045 7,281 8,899 12,135 26,697 36,405 44,495 80,091 133,485 and 400,455, with no remainder.
Since 400,455 cannot be divided by just 1 and 400,455, it is not a prime number.