A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1093500 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 81 90 100 108 125 135 150 162 180 225 243 250 270 300 324 375 405 450 486 500 540 675 729 750 810 900 972 1,125 1,215 1,350 1,458 1,500 1,620 2,025 2,187 2,250 2,430 2,700 2,916 3,375 3,645 4,050 4,374 4,500 4,860 6,075 6,750 7,290 8,100 8,748 10,125 10,935 12,150 13,500 14,580 18,225 20,250 21,870 24,300 30,375 36,450 40,500 43,740 54,675 60,750 72,900 91,125 109,350 121,500 182,250 218,700 273,375 364,500 546,750 and 1,093,500, with no remainder.
Since 1,093,500 cannot be divided by just 1 and 1,093,500, it is not a prime number.