Q: Is 401,643 a Prime Number?
A: No, 401,643 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 401643 can be evenly divided by 1 3 9 11 33 99 4,057 12,171 36,513 44,627 133,881 and 401,643, with no remainder.
Since 401,643 cannot be divided by just 1 and 401,643, it is not a prime number.