Q: Is 1,640,604 a Prime Number?
A: No, 1,640,604 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 1640604 can be evenly divided by 1 2 3 4 6 7 12 14 21 28 42 84 19,531 39,062 58,593 78,124 117,186 136,717 234,372 273,434 410,151 546,868 820,302 and 1,640,604, with no remainder.
Since 1,640,604 cannot be divided by just 1 and 1,640,604, it is not a prime number.