Q: Is 1,261,664 a Prime Number?
A: No, 1,261,664 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 1261664 can be evenly divided by 1 2 4 8 16 32 89 178 356 443 712 886 1,424 1,772 2,848 3,544 7,088 14,176 39,427 78,854 157,708 315,416 630,832 and 1,261,664, with no remainder.
Since 1,261,664 cannot be divided by just 1 and 1,261,664, it is not a prime number.