Q: Is 400,921 a Prime Number?
A: No, 400,921 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 400921 can be evenly divided by 1 587 683 and 400,921, with no remainder.
Since 400,921 cannot be divided by just 1 and 400,921, it is not a prime number.