A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7946730 can be evenly divided by 1 2 3 5 6 9 10 11 15 18 22 23 30 33 45 46 55 66 69 90 99 110 115 138 165 198 207 230 253 330 345 349 414 495 506 690 698 759 990 1,035 1,047 1,265 1,518 1,745 2,070 2,094 2,277 2,530 3,141 3,490 3,795 3,839 4,554 5,235 6,282 7,590 7,678 8,027 10,470 11,385 11,517 15,705 16,054 19,195 22,770 23,034 24,081 31,410 34,551 38,390 40,135 48,162 57,585 69,102 72,243 80,270 88,297 115,170 120,405 144,486 172,755 176,594 240,810 264,891 345,510 361,215 441,485 529,782 722,430 794,673 882,970 1,324,455 1,589,346 2,648,910 3,973,365 and 7,946,730, with no remainder.
Since 7,946,730 cannot be divided by just 1 and 7,946,730, it is not a prime number.