Q: Is 1,664 a Prime Number?
A: No, 1,664 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 1664 can be evenly divided by 1 2 4 8 13 16 26 32 52 64 104 128 208 416 832 and 1,664, with no remainder.
Since 1,664 cannot be divided by just 1 and 1,664, it is not a prime number.