Q: Is 643,435 a Prime Number?
A: No, 643,435 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 643435 can be evenly divided by 1 5 13 19 65 95 247 521 1,235 2,605 6,773 9,899 33,865 49,495 128,687 and 643,435, with no remainder.
Since 643,435 cannot be divided by just 1 and 643,435, it is not a prime number.