Q: Is 1,555,506 a Prime Number?
A: No, 1,555,506 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 1555506 can be evenly divided by 1 2 3 6 9 18 103 206 309 618 839 927 1,678 1,854 2,517 5,034 7,551 15,102 86,417 172,834 259,251 518,502 777,753 and 1,555,506, with no remainder.
Since 1,555,506 cannot be divided by just 1 and 1,555,506, it is not a prime number.