Q: Is 1,561,698 a Prime Number?
A: No, 1,561,698 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 1561698 can be evenly divided by 1 2 3 6 9 18 53 106 159 318 477 954 1,637 3,274 4,911 9,822 14,733 29,466 86,761 173,522 260,283 520,566 780,849 and 1,561,698, with no remainder.
Since 1,561,698 cannot be divided by just 1 and 1,561,698, it is not a prime number.