The number 1,712,340 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 27 28 30 35 36 42 45 54 60 63 70 81 84 90 105 108 126 135 140 151 162 180 189 210 252 270 302 315 324 378 405 420 453 540 567 604 630 755 756 810 906 945 1,057 1,134 1,260 1,359 1,510 1,620 1,812 1,890 2,114 2,265 2,268 2,718 2,835 3,020 3,171 3,780 4,077 4,228 4,530 5,285 5,436 5,670 6,342 6,795 8,154 9,060 9,513 10,570 11,340 12,231 12,684 13,590 15,855 16,308 19,026 20,385 21,140 24,462 27,180 28,539 31,710 38,052 40,770 47,565 48,924 57,078 61,155 63,420 81,540 85,617 95,130 114,156 122,310 142,695 171,234 190,260 244,620 285,390 342,468 428,085 570,780 856,170 and 1,712,340, with no remainder.
Since 1,712,340 cannot be divided by just 1 and 1,712,340, it is a composite number.