Q: Is 643,071 a Prime Number?
A: No, 643,071 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 643071 can be evenly divided by 1 3 11 13 33 39 143 429 1,499 4,497 16,489 19,487 49,467 58,461 214,357 and 643,071, with no remainder.
Since 643,071 cannot be divided by just 1 and 643,071, it is not a prime number.