Q: Is 687,870 a Prime Number?
A: No, 687,870 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 687870 can be evenly divided by 1 2 3 5 6 9 10 15 18 30 45 90 7,643 15,286 22,929 38,215 45,858 68,787 76,430 114,645 137,574 229,290 343,935 and 687,870, with no remainder.
Since 687,870 cannot be divided by just 1 and 687,870, it is not a prime number.