Q: Is 1,999,664 a Prime Number?
A: No, 1,999,664 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 1999664 can be evenly divided by 1 2 4 8 16 124,979 249,958 499,916 999,832 and 1,999,664, with no remainder.
Since 1,999,664 cannot be divided by just 1 and 1,999,664, it is not a prime number.