A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7660440 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 36 40 41 45 54 60 72 82 90 108 120 123 135 164 173 180 205 216 246 270 328 346 360 369 410 492 519 540 615 692 738 820 865 984 1,038 1,080 1,107 1,230 1,384 1,476 1,557 1,640 1,730 1,845 2,076 2,214 2,460 2,595 2,952 3,114 3,460 3,690 4,152 4,428 4,671 4,920 5,190 5,535 6,228 6,920 7,093 7,380 7,785 8,856 9,342 10,380 11,070 12,456 14,186 14,760 15,570 18,684 20,760 21,279 22,140 23,355 28,372 31,140 35,465 37,368 42,558 44,280 46,710 56,744 62,280 63,837 70,930 85,116 93,420 106,395 127,674 141,860 170,232 186,840 191,511 212,790 255,348 283,720 319,185 383,022 425,580 510,696 638,370 766,044 851,160 957,555 1,276,740 1,532,088 1,915,110 2,553,480 3,830,220 and 7,660,440, with no remainder.
Since 7,660,440 cannot be divided by just 1 and 7,660,440, it is not a prime number.