A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1574100 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 25 27 30 33 36 44 45 50 53 54 55 60 66 75 90 99 100 106 108 110 132 135 150 159 165 180 198 212 220 225 265 270 275 297 300 318 330 396 450 477 495 530 540 550 583 594 636 660 675 795 825 900 954 990 1,060 1,100 1,166 1,188 1,325 1,350 1,431 1,485 1,590 1,650 1,749 1,908 1,980 2,332 2,385 2,475 2,650 2,700 2,862 2,915 2,970 3,180 3,300 3,498 3,975 4,770 4,950 5,247 5,300 5,724 5,830 5,940 6,996 7,155 7,425 7,950 8,745 9,540 9,900 10,494 11,660 11,925 14,310 14,575 14,850 15,741 15,900 17,490 20,988 23,850 26,235 28,620 29,150 29,700 31,482 34,980 35,775 43,725 47,700 52,470 58,300 62,964 71,550 78,705 87,450 104,940 131,175 143,100 157,410 174,900 262,350 314,820 393,525 524,700 787,050 and 1,574,100, with no remainder.
Since 1,574,100 cannot be divided by just 1 and 1,574,100, it is not a prime number.