Q: Is 643,225 a Prime Number?
A: No, 643,225 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 643225 can be evenly divided by 1 5 11 25 55 275 2,339 11,695 25,729 58,475 128,645 and 643,225, with no remainder.
Since 643,225 cannot be divided by just 1 and 643,225, it is not a prime number.