Q: Is 787,420 a Prime Number?
A: No, 787,420 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 787420 can be evenly divided by 1 2 4 5 10 20 39,371 78,742 157,484 196,855 393,710 and 787,420, with no remainder.
Since 787,420 cannot be divided by just 1 and 787,420, it is not a prime number.