A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1563100 can be evenly divided by 1 2 4 5 7 10 11 14 20 22 25 28 29 35 44 49 50 55 58 70 77 98 100 110 116 140 145 154 175 196 203 220 245 275 290 308 319 350 385 406 490 539 550 580 638 700 725 770 812 980 1,015 1,078 1,100 1,225 1,276 1,421 1,450 1,540 1,595 1,925 2,030 2,156 2,233 2,450 2,695 2,842 2,900 3,190 3,850 4,060 4,466 4,900 5,075 5,390 5,684 6,380 7,105 7,700 7,975 8,932 10,150 10,780 11,165 13,475 14,210 15,631 15,950 20,300 22,330 26,950 28,420 31,262 31,900 35,525 44,660 53,900 55,825 62,524 71,050 78,155 111,650 142,100 156,310 223,300 312,620 390,775 781,550 and 1,563,100, with no remainder.
Since 1,563,100 cannot be divided by just 1 and 1,563,100, it is not a prime number.