A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1710000 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 19 20 24 25 30 36 38 40 45 48 50 57 60 72 75 76 80 90 95 100 114 120 125 144 150 152 171 180 190 200 225 228 240 250 285 300 304 342 360 375 380 400 450 456 475 500 570 600 625 684 720 750 760 855 900 912 950 1,000 1,125 1,140 1,200 1,250 1,368 1,425 1,500 1,520 1,710 1,800 1,875 1,900 2,000 2,250 2,280 2,375 2,500 2,736 2,850 3,000 3,420 3,600 3,750 3,800 4,275 4,500 4,560 4,750 5,000 5,625 5,700 6,000 6,840 7,125 7,500 7,600 8,550 9,000 9,500 10,000 11,250 11,400 11,875 13,680 14,250 15,000 17,100 18,000 19,000 21,375 22,500 22,800 23,750 28,500 30,000 34,200 35,625 38,000 42,750 45,000 47,500 57,000 68,400 71,250 85,500 90,000 95,000 106,875 114,000 142,500 171,000 190,000 213,750 285,000 342,000 427,500 570,000 855,000 and 1,710,000, with no remainder.
Since 1,710,000 cannot be divided by just 1 and 1,710,000, it is not a prime number.