A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5760960 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 17 20 24 30 32 34 40 48 51 60 64 68 80 85 96 102 120 136 160 170 192 204 240 255 272 320 340 353 408 480 510 544 680 706 816 960 1,020 1,059 1,088 1,360 1,412 1,632 1,765 2,040 2,118 2,720 2,824 3,264 3,530 4,080 4,236 5,295 5,440 5,648 6,001 7,060 8,160 8,472 10,590 11,296 12,002 14,120 16,320 16,944 18,003 21,180 22,592 24,004 28,240 30,005 33,888 36,006 42,360 48,008 56,480 60,010 67,776 72,012 84,720 90,015 96,016 112,960 120,020 144,024 169,440 180,030 192,032 240,040 288,048 338,880 360,060 384,064 480,080 576,096 720,120 960,160 1,152,192 1,440,240 1,920,320 2,880,480 and 5,760,960, with no remainder.
Since 5,760,960 cannot be divided by just 1 and 5,760,960, it is not a prime number.