A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7177170 can be evenly divided by 1 2 3 5 6 7 10 11 13 14 15 21 22 26 30 33 35 39 42 55 65 66 70 77 78 91 105 110 130 143 154 165 182 195 210 231 239 273 286 330 385 390 429 455 462 478 546 715 717 770 858 910 1,001 1,155 1,195 1,365 1,430 1,434 1,673 2,002 2,145 2,310 2,390 2,629 2,730 3,003 3,107 3,346 3,585 4,290 5,005 5,019 5,258 6,006 6,214 7,170 7,887 8,365 9,321 10,010 10,038 13,145 15,015 15,535 15,774 16,730 18,403 18,642 21,749 25,095 26,290 30,030 31,070 34,177 36,806 39,435 43,498 46,605 50,190 55,209 65,247 68,354 78,870 92,015 93,210 102,531 108,745 110,418 130,494 170,885 184,030 205,062 217,490 239,239 276,045 326,235 341,770 478,478 512,655 552,090 652,470 717,717 1,025,310 1,196,195 1,435,434 2,392,390 3,588,585 and 7,177,170, with no remainder.
Since 7,177,170 cannot be divided by just 1 and 7,177,170, it is not a prime number.