Q: Is 777,640 a Prime Number?
A: No, 777,640 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 777640 can be evenly divided by 1 2 4 5 8 10 20 40 19,441 38,882 77,764 97,205 155,528 194,410 388,820 and 777,640, with no remainder.
Since 777,640 cannot be divided by just 1 and 777,640, it is not a prime number.