A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6176040 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 20 24 26 30 37 39 40 52 60 65 74 78 104 107 111 120 130 148 156 185 195 214 222 260 296 312 321 370 390 428 444 481 520 535 555 642 740 780 856 888 962 1,070 1,110 1,284 1,391 1,443 1,480 1,560 1,605 1,924 2,140 2,220 2,405 2,568 2,782 2,886 3,210 3,848 3,959 4,173 4,280 4,440 4,810 5,564 5,772 6,420 6,955 7,215 7,918 8,346 9,620 11,128 11,544 11,877 12,840 13,910 14,430 15,836 16,692 19,240 19,795 20,865 23,754 27,820 28,860 31,672 33,384 39,590 41,730 47,508 51,467 55,640 57,720 59,385 79,180 83,460 95,016 102,934 118,770 154,401 158,360 166,920 205,868 237,540 257,335 308,802 411,736 475,080 514,670 617,604 772,005 1,029,340 1,235,208 1,544,010 2,058,680 3,088,020 and 6,176,040, with no remainder.
Since 6,176,040 cannot be divided by just 1 and 6,176,040, it is not a prime number.