A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 960750 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 25 30 35 42 45 50 61 63 70 75 90 105 122 125 126 150 175 183 210 225 250 305 315 350 366 375 427 450 525 549 610 630 750 854 875 915 1,050 1,098 1,125 1,281 1,525 1,575 1,750 1,830 2,135 2,250 2,562 2,625 2,745 3,050 3,150 3,843 4,270 4,575 5,250 5,490 6,405 7,625 7,686 7,875 9,150 10,675 12,810 13,725 15,250 15,750 19,215 21,350 22,875 27,450 32,025 38,430 45,750 53,375 64,050 68,625 96,075 106,750 137,250 160,125 192,150 320,250 480,375 and 960,750, with no remainder.
Since 960,750 cannot be divided by just 1 and 960,750, it is not a prime number.