A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 754650 can be evenly divided by 1 2 3 5 6 9 10 13 15 18 25 26 27 30 39 43 45 50 54 65 75 78 86 90 117 129 130 135 150 195 215 225 234 258 270 325 351 387 390 430 450 559 585 645 650 675 702 774 975 1,075 1,118 1,161 1,170 1,290 1,350 1,677 1,755 1,935 1,950 2,150 2,322 2,795 2,925 3,225 3,354 3,510 3,870 5,031 5,590 5,805 5,850 6,450 8,385 8,775 9,675 10,062 11,610 13,975 15,093 16,770 17,550 19,350 25,155 27,950 29,025 30,186 41,925 50,310 58,050 75,465 83,850 125,775 150,930 251,550 377,325 and 754,650, with no remainder.
Since 754,650 cannot be divided by just 1 and 754,650, it is not a prime number.