A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9789480 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 30 36 40 45 60 71 72 90 120 142 180 213 284 355 360 383 426 568 639 710 766 852 1,065 1,149 1,278 1,420 1,532 1,704 1,915 2,130 2,298 2,556 2,840 3,064 3,195 3,447 3,830 4,260 4,596 5,112 5,745 6,390 6,894 7,660 8,520 9,192 11,490 12,780 13,788 15,320 17,235 22,980 25,560 27,193 27,576 34,470 45,960 54,386 68,940 81,579 108,772 135,965 137,880 163,158 217,544 244,737 271,930 326,316 407,895 489,474 543,860 652,632 815,790 978,948 1,087,720 1,223,685 1,631,580 1,957,896 2,447,370 3,263,160 4,894,740 and 9,789,480, with no remainder.
Since 9,789,480 cannot be divided by just 1 and 9,789,480, it is not a prime number.