Q: Is 656,820 a Prime Number?
A: No, 656,820 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 656820 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 30 36 41 45 60 82 89 90 123 164 178 180 205 246 267 356 369 410 445 492 534 615 738 801 820 890 1,068 1,230 1,335 1,476 1,602 1,780 1,845 2,460 2,670 3,204 3,649 3,690 4,005 5,340 7,298 7,380 8,010 10,947 14,596 16,020 18,245 21,894 32,841 36,490 43,788 54,735 65,682 72,980 109,470 131,364 164,205 218,940 328,410 and 656,820, with no remainder.
Since 656,820 cannot be divided by just 1 and 656,820, it is not a prime number.