A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7170000 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 40 48 50 60 75 80 100 120 125 150 200 239 240 250 300 375 400 478 500 600 625 717 750 956 1,000 1,195 1,200 1,250 1,434 1,500 1,875 1,912 2,000 2,390 2,500 2,868 3,000 3,585 3,750 3,824 4,780 5,000 5,736 5,975 6,000 7,170 7,500 9,560 10,000 11,472 11,950 14,340 15,000 17,925 19,120 23,900 28,680 29,875 30,000 35,850 47,800 57,360 59,750 71,700 89,625 95,600 119,500 143,400 149,375 179,250 239,000 286,800 298,750 358,500 448,125 478,000 597,500 717,000 896,250 1,195,000 1,434,000 1,792,500 2,390,000 3,585,000 and 7,170,000, with no remainder.
Since 7,170,000 cannot be divided by just 1 and 7,170,000, it is not a prime number.