Q: Is 643,425 a Prime Number?
A: No, 643,425 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 643425 can be evenly divided by 1 3 5 15 23 25 69 75 115 345 373 575 1,119 1,725 1,865 5,595 8,579 9,325 25,737 27,975 42,895 128,685 214,475 and 643,425, with no remainder.
Since 643,425 cannot be divided by just 1 and 643,425, it is not a prime number.