A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5571900 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 25 30 36 41 45 50 60 75 82 90 100 123 150 151 164 180 205 225 246 300 302 369 410 450 453 492 604 615 738 755 820 900 906 1,025 1,230 1,359 1,476 1,510 1,812 1,845 2,050 2,265 2,460 2,718 3,020 3,075 3,690 3,775 4,100 4,530 5,436 6,150 6,191 6,795 7,380 7,550 9,060 9,225 11,325 12,300 12,382 13,590 15,100 18,450 18,573 22,650 24,764 27,180 30,955 33,975 36,900 37,146 45,300 55,719 61,910 67,950 74,292 92,865 111,438 123,820 135,900 154,775 185,730 222,876 278,595 309,550 371,460 464,325 557,190 619,100 928,650 1,114,380 1,392,975 1,857,300 2,785,950 and 5,571,900, with no remainder.
Since 5,571,900 cannot be divided by just 1 and 5,571,900, it is not a prime number.