Q: Is 669,640 a Prime Number?
A: No, 669,640 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 669640 can be evenly divided by 1 2 4 5 8 10 20 40 16,741 33,482 66,964 83,705 133,928 167,410 334,820 and 669,640, with no remainder.
Since 669,640 cannot be divided by just 1 and 669,640, it is not a prime number.