A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1170000 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 16 18 20 24 25 26 30 36 39 40 45 48 50 52 60 65 72 75 78 80 90 100 104 117 120 125 130 144 150 156 180 195 200 208 225 234 240 250 260 300 312 325 360 375 390 400 450 468 500 520 585 600 624 625 650 720 750 780 900 936 975 1,000 1,040 1,125 1,170 1,200 1,250 1,300 1,500 1,560 1,625 1,800 1,872 1,875 1,950 2,000 2,250 2,340 2,500 2,600 2,925 3,000 3,120 3,250 3,600 3,750 3,900 4,500 4,680 4,875 5,000 5,200 5,625 5,850 6,000 6,500 7,500 7,800 8,125 9,000 9,360 9,750 10,000 11,250 11,700 13,000 14,625 15,000 15,600 16,250 18,000 19,500 22,500 23,400 24,375 26,000 29,250 30,000 32,500 39,000 45,000 46,800 48,750 58,500 65,000 73,125 78,000 90,000 97,500 117,000 130,000 146,250 195,000 234,000 292,500 390,000 585,000 and 1,170,000, with no remainder.
Since 1,170,000 cannot be divided by just 1 and 1,170,000, it is not a prime number.