Q: Is 655,720 a Prime Number?
A: No, 655,720 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 655720 can be evenly divided by 1 2 4 5 8 10 13 20 26 40 52 65 97 104 130 169 194 260 338 388 485 520 676 776 845 970 1,261 1,352 1,690 1,940 2,522 3,380 3,880 5,044 6,305 6,760 10,088 12,610 16,393 25,220 32,786 50,440 65,572 81,965 131,144 163,930 327,860 and 655,720, with no remainder.
Since 655,720 cannot be divided by just 1 and 655,720, it is not a prime number.