A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9429750 can be evenly divided by 1 2 3 5 6 9 10 11 15 18 22 25 27 30 33 45 50 54 55 66 75 90 99 110 125 127 135 150 165 198 225 250 254 270 275 297 330 375 381 450 495 550 594 635 675 750 762 825 990 1,125 1,143 1,270 1,350 1,375 1,397 1,485 1,650 1,905 2,250 2,286 2,475 2,750 2,794 2,970 3,175 3,375 3,429 3,810 4,125 4,191 4,950 5,715 6,350 6,750 6,858 6,985 7,425 8,250 8,382 9,525 11,430 12,375 12,573 13,970 14,850 15,875 17,145 19,050 20,955 24,750 25,146 28,575 31,750 34,290 34,925 37,125 37,719 41,910 47,625 57,150 62,865 69,850 74,250 75,438 85,725 95,250 104,775 125,730 142,875 171,450 174,625 188,595 209,550 285,750 314,325 349,250 377,190 428,625 523,875 628,650 857,250 942,975 1,047,750 1,571,625 1,885,950 3,143,250 4,714,875 and 9,429,750, with no remainder.
Since 9,429,750 cannot be divided by just 1 and 9,429,750, it is not a prime number.