Q: Is 643,437 a Prime Number?
A: No, 643,437 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 643437 can be evenly divided by 1 3 9 27 23,831 71,493 214,479 and 643,437, with no remainder.
Since 643,437 cannot be divided by just 1 and 643,437, it is not a prime number.