Q: Is 645,500 a Prime Number?
A: No, 645,500 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 645500 can be evenly divided by 1 2 4 5 10 20 25 50 100 125 250 500 1,291 2,582 5,164 6,455 12,910 25,820 32,275 64,550 129,100 161,375 322,750 and 645,500, with no remainder.
Since 645,500 cannot be divided by just 1 and 645,500, it is not a prime number.