A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5215200 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 25 30 32 40 41 48 50 53 60 75 80 82 96 100 106 120 123 150 159 160 164 200 205 212 240 246 265 300 318 328 400 410 424 480 492 530 600 615 636 656 795 800 820 848 984 1,025 1,060 1,200 1,230 1,272 1,312 1,325 1,590 1,640 1,696 1,968 2,050 2,120 2,173 2,400 2,460 2,544 2,650 3,075 3,180 3,280 3,936 3,975 4,100 4,240 4,346 4,920 5,088 5,300 6,150 6,360 6,519 6,560 7,950 8,200 8,480 8,692 9,840 10,600 10,865 12,300 12,720 13,038 15,900 16,400 17,384 19,680 21,200 21,730 24,600 25,440 26,076 31,800 32,595 32,800 34,768 42,400 43,460 49,200 52,152 54,325 63,600 65,190 69,536 86,920 98,400 104,304 108,650 127,200 130,380 162,975 173,840 208,608 217,300 260,760 325,950 347,680 434,600 521,520 651,900 869,200 1,043,040 1,303,800 1,738,400 2,607,600 and 5,215,200, with no remainder.
Since 5,215,200 cannot be divided by just 1 and 5,215,200, it is not a prime number.