A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9376560 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 36 40 45 48 54 60 72 80 81 90 108 120 135 144 162 180 216 240 270 324 360 405 432 540 648 720 810 1,080 1,296 1,447 1,620 2,160 2,894 3,240 4,341 5,788 6,480 7,235 8,682 11,576 13,023 14,470 17,364 21,705 23,152 26,046 28,940 34,728 39,069 43,410 52,092 57,880 65,115 69,456 78,138 86,820 104,184 115,760 117,207 130,230 156,276 173,640 195,345 208,368 234,414 260,460 312,552 347,280 390,690 468,828 520,920 586,035 625,104 781,380 937,656 1,041,840 1,172,070 1,562,760 1,875,312 2,344,140 3,125,520 4,688,280 and 9,376,560, with no remainder.
Since 9,376,560 cannot be divided by just 1 and 9,376,560, it is not a prime number.