A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2073680 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 23 28 35 40 46 49 56 70 80 92 98 112 115 140 161 184 196 230 245 280 322 368 392 460 490 529 560 644 784 805 920 980 1,058 1,127 1,288 1,610 1,840 1,960 2,116 2,254 2,576 2,645 3,220 3,703 3,920 4,232 4,508 5,290 5,635 6,440 7,406 8,464 9,016 10,580 11,270 12,880 14,812 18,032 18,515 21,160 22,540 25,921 29,624 37,030 42,320 45,080 51,842 59,248 74,060 90,160 103,684 129,605 148,120 207,368 259,210 296,240 414,736 518,420 1,036,840 and 2,073,680, with no remainder.
Since 2,073,680 cannot be divided by just 1 and 2,073,680, it is not a prime number.