A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1047420 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 23 30 33 36 44 45 46 55 60 66 69 90 92 99 110 115 132 138 165 180 198 207 220 230 253 276 330 345 396 414 460 495 506 529 660 690 759 828 990 1,012 1,035 1,058 1,265 1,380 1,518 1,587 1,980 2,070 2,116 2,277 2,530 2,645 3,036 3,174 3,795 4,140 4,554 4,761 5,060 5,290 5,819 6,348 7,590 7,935 9,108 9,522 10,580 11,385 11,638 15,180 15,870 17,457 19,044 22,770 23,276 23,805 29,095 31,740 34,914 45,540 47,610 52,371 58,190 69,828 87,285 95,220 104,742 116,380 174,570 209,484 261,855 349,140 523,710 and 1,047,420, with no remainder.
Since 1,047,420 cannot be divided by just 1 and 1,047,420, it is not a prime number.