A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3089760 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 30 32 40 41 48 60 80 82 96 120 123 157 160 164 205 240 246 314 328 410 471 480 492 615 628 656 785 820 942 984 1,230 1,256 1,312 1,570 1,640 1,884 1,968 2,355 2,460 2,512 3,140 3,280 3,768 3,936 4,710 4,920 5,024 6,280 6,437 6,560 7,536 9,420 9,840 12,560 12,874 15,072 18,840 19,311 19,680 25,120 25,748 32,185 37,680 38,622 51,496 64,370 75,360 77,244 96,555 102,992 128,740 154,488 193,110 205,984 257,480 308,976 386,220 514,960 617,952 772,440 1,029,920 1,544,880 and 3,089,760, with no remainder.
Since 3,089,760 cannot be divided by just 1 and 3,089,760, it is not a prime number.