The number 3,156,480 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 32 36 40 45 48 60 64 72 80 90 96 120 128 137 144 160 180 192 240 256 274 288 320 360 384 411 480 512 548 576 640 685 720 768 822 960 1,096 1,152 1,233 1,280 1,370 1,440 1,536 1,644 1,920 2,055 2,192 2,304 2,466 2,560 2,740 2,880 3,288 3,840 4,110 4,384 4,608 4,932 5,480 5,760 6,165 6,576 7,680 8,220 8,768 9,864 10,960 11,520 12,330 13,152 16,440 17,536 19,728 21,920 23,040 24,660 26,304 32,880 35,072 39,456 43,840 49,320 52,608 65,760 70,144 78,912 87,680 98,640 105,216 131,520 157,824 175,360 197,280 210,432 263,040 315,648 350,720 394,560 526,080 631,296 789,120 1,052,160 1,578,240 and 3,156,480, with no remainder.
Since 3,156,480 cannot be divided by just 1 and 3,156,480, it is a composite number.