Q: Is 1,666,404 a Prime Number?
A: No, 1,666,404 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 1666404 can be evenly divided by 1 2 3 4 6 9 12 18 36 41 82 123 164 246 369 492 738 1,129 1,476 2,258 3,387 4,516 6,774 10,161 13,548 20,322 40,644 46,289 92,578 138,867 185,156 277,734 416,601 555,468 833,202 and 1,666,404, with no remainder.
Since 1,666,404 cannot be divided by just 1 and 1,666,404, it is not a prime number.