A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5140960 can be evenly divided by 1 2 4 5 8 10 11 16 20 22 23 32 40 44 46 55 80 88 92 110 115 127 160 176 184 220 230 253 254 352 368 440 460 506 508 635 736 880 920 1,012 1,016 1,265 1,270 1,397 1,760 1,840 2,024 2,032 2,530 2,540 2,794 2,921 3,680 4,048 4,064 5,060 5,080 5,588 5,842 6,985 8,096 10,120 10,160 11,176 11,684 13,970 14,605 20,240 20,320 22,352 23,368 27,940 29,210 32,131 40,480 44,704 46,736 55,880 58,420 64,262 93,472 111,760 116,840 128,524 160,655 223,520 233,680 257,048 321,310 467,360 514,096 642,620 1,028,192 1,285,240 2,570,480 and 5,140,960, with no remainder.
Since 5,140,960 cannot be divided by just 1 and 5,140,960, it is not a prime number.