Q: Is 77,920 a Prime Number?
A: No, 77,920 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 77920 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 80 160 487 974 1,948 2,435 3,896 4,870 7,792 9,740 15,584 19,480 38,960 and 77,920, with no remainder.
Since 77,920 cannot be divided by just 1 and 77,920, it is not a prime number.