A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7743330 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 17 18 21 27 30 34 35 42 45 51 54 63 70 85 90 102 105 119 126 135 153 170 189 210 238 241 255 270 306 315 357 378 459 482 510 595 630 714 723 765 918 945 1,071 1,190 1,205 1,446 1,530 1,687 1,785 1,890 2,142 2,169 2,295 2,410 3,213 3,374 3,570 3,615 4,097 4,338 4,590 5,061 5,355 6,426 6,507 7,230 8,194 8,435 10,122 10,710 10,845 12,291 13,014 15,183 16,065 16,870 20,485 21,690 24,582 25,305 28,679 30,366 32,130 32,535 36,873 40,970 45,549 50,610 57,358 61,455 65,070 73,746 75,915 86,037 91,098 110,619 122,910 143,395 151,830 172,074 184,365 221,238 227,745 258,111 286,790 368,730 430,185 455,490 516,222 553,095 774,333 860,370 1,106,190 1,290,555 1,548,666 2,581,110 3,871,665 and 7,743,330, with no remainder.
Since 7,743,330 cannot be divided by just 1 and 7,743,330, it is not a prime number.