A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5543460 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 23 26 30 36 39 45 46 52 60 65 69 78 90 92 103 115 117 130 138 156 180 195 206 207 230 234 260 276 299 309 345 390 412 414 460 468 515 585 598 618 690 780 828 897 927 1,030 1,035 1,170 1,196 1,236 1,339 1,380 1,495 1,545 1,794 1,854 2,060 2,070 2,340 2,369 2,678 2,691 2,990 3,090 3,588 3,708 4,017 4,140 4,485 4,635 4,738 5,356 5,382 5,980 6,180 6,695 7,107 8,034 8,970 9,270 9,476 10,764 11,845 12,051 13,390 13,455 14,214 16,068 17,940 18,540 20,085 21,321 23,690 24,102 26,780 26,910 28,428 30,797 35,535 40,170 42,642 47,380 48,204 53,820 60,255 61,594 71,070 80,340 85,284 92,391 106,605 120,510 123,188 142,140 153,985 184,782 213,210 241,020 277,173 307,970 369,564 426,420 461,955 554,346 615,940 923,910 1,108,692 1,385,865 1,847,820 2,771,730 and 5,543,460, with no remainder.
Since 5,543,460 cannot be divided by just 1 and 5,543,460, it is not a prime number.