Q: Is 667,840 a Prime Number?
A: No, 667,840 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 667840 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 160 320 2,087 4,174 8,348 10,435 16,696 20,870 33,392 41,740 66,784 83,480 133,568 166,960 333,920 and 667,840, with no remainder.
Since 667,840 cannot be divided by just 1 and 667,840, it is not a prime number.