Q: Is 678,920 a Prime Number?
A: No, 678,920 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 678920 can be evenly divided by 1 2 4 5 8 10 11 20 22 40 44 55 88 110 220 440 1,543 3,086 6,172 7,715 12,344 15,430 16,973 30,860 33,946 61,720 67,892 84,865 135,784 169,730 339,460 and 678,920, with no remainder.
Since 678,920 cannot be divided by just 1 and 678,920, it is not a prime number.