Q: Is 820,820 a Prime Number?
A: No, 820,820 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 820820 can be evenly divided by 1 2 4 5 7 10 11 13 14 20 22 26 28 35 41 44 52 55 65 70 77 82 91 110 130 140 143 154 164 182 205 220 260 286 287 308 364 385 410 451 455 533 572 574 715 770 820 902 910 1,001 1,066 1,148 1,430 1,435 1,540 1,804 1,820 2,002 2,132 2,255 2,665 2,860 2,870 3,157 3,731 4,004 4,510 5,005 5,330 5,740 5,863 6,314 7,462 9,020 10,010 10,660 11,726 12,628 14,924 15,785 18,655 20,020 23,452 29,315 31,570 37,310 41,041 58,630 63,140 74,620 82,082 117,260 164,164 205,205 410,410 and 820,820, with no remainder.
Since 820,820 cannot be divided by just 1 and 820,820, it is not a prime number.