Q: Is 687,423 a Prime Number?
A: No, 687,423 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 687423 can be evenly divided by 1 3 11 33 37 111 407 563 1,221 1,689 6,193 18,579 20,831 62,493 229,141 and 687,423, with no remainder.
Since 687,423 cannot be divided by just 1 and 687,423, it is not a prime number.