Q: Is 77,840 a Prime Number?
A: No, 77,840 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 77840 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 35 40 56 70 80 112 139 140 278 280 556 560 695 973 1,112 1,390 1,946 2,224 2,780 3,892 4,865 5,560 7,784 9,730 11,120 15,568 19,460 38,920 and 77,840, with no remainder.
Since 77,840 cannot be divided by just 1 and 77,840, it is not a prime number.