Q: Is 77,720 a Prime Number?
A: No, 77,720 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 77720 can be evenly divided by 1 2 4 5 8 10 20 29 40 58 67 116 134 145 232 268 290 335 536 580 670 1,160 1,340 1,943 2,680 3,886 7,772 9,715 15,544 19,430 38,860 and 77,720, with no remainder.
Since 77,720 cannot be divided by just 1 and 77,720, it is not a prime number.