A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6760480 can be evenly divided by 1 2 4 5 8 10 16 20 29 31 32 40 47 58 62 80 94 116 124 145 155 160 188 232 235 248 290 310 376 464 470 496 580 620 752 899 928 940 992 1,160 1,240 1,363 1,457 1,504 1,798 1,880 2,320 2,480 2,726 2,914 3,596 3,760 4,495 4,640 4,960 5,452 5,828 6,815 7,192 7,285 7,520 8,990 10,904 11,656 13,630 14,384 14,570 17,980 21,808 23,312 27,260 28,768 29,140 35,960 42,253 43,616 46,624 54,520 58,280 71,920 84,506 109,040 116,560 143,840 169,012 211,265 218,080 233,120 338,024 422,530 676,048 845,060 1,352,096 1,690,120 3,380,240 and 6,760,480, with no remainder.
Since 6,760,480 cannot be divided by just 1 and 6,760,480, it is not a prime number.