A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7407000 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 25 30 36 40 45 50 60 72 75 90 100 120 125 150 180 200 225 250 300 360 375 450 500 600 750 823 900 1,000 1,125 1,500 1,646 1,800 2,250 2,469 3,000 3,292 4,115 4,500 4,938 6,584 7,407 8,230 9,000 9,876 12,345 14,814 16,460 19,752 20,575 24,690 29,628 32,920 37,035 41,150 49,380 59,256 61,725 74,070 82,300 98,760 102,875 123,450 148,140 164,600 185,175 205,750 246,900 296,280 308,625 370,350 411,500 493,800 617,250 740,700 823,000 925,875 1,234,500 1,481,400 1,851,750 2,469,000 3,703,500 and 7,407,000, with no remainder.
Since 7,407,000 cannot be divided by just 1 and 7,407,000, it is not a prime number.