Q: Is 668,608 a Prime Number?
A: No, 668,608 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 668608 can be evenly divided by 1 2 4 8 16 31 32 62 64 124 248 337 496 674 992 1,348 1,984 2,696 5,392 10,447 10,784 20,894 21,568 41,788 83,576 167,152 334,304 and 668,608, with no remainder.
Since 668,608 cannot be divided by just 1 and 668,608, it is not a prime number.