Q: Is 1,687,500 a Prime Number?
A: No, 1,687,500 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1687500 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 25 27 30 36 45 50 54 60 75 90 100 108 125 135 150 180 225 250 270 300 375 450 500 540 625 675 750 900 1,125 1,250 1,350 1,500 1,875 2,250 2,500 2,700 3,125 3,375 3,750 4,500 5,625 6,250 6,750 7,500 9,375 11,250 12,500 13,500 15,625 16,875 18,750 22,500 28,125 31,250 33,750 37,500 46,875 56,250 62,500 67,500 84,375 93,750 112,500 140,625 168,750 187,500 281,250 337,500 421,875 562,500 843,750 and 1,687,500, with no remainder.
Since 1,687,500 cannot be divided by just 1 and 1,687,500, it is not a prime number.