A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5353110 can be evenly divided by 1 2 3 5 6 7 9 10 14 15 18 21 29 30 35 42 45 58 63 70 87 90 105 126 145 174 203 210 261 290 293 315 406 435 522 586 609 630 870 879 1,015 1,218 1,305 1,465 1,758 1,827 2,030 2,051 2,610 2,637 2,930 3,045 3,654 4,102 4,395 5,274 6,090 6,153 8,497 8,790 9,135 10,255 12,306 13,185 16,994 18,270 18,459 20,510 25,491 26,370 30,765 36,918 42,485 50,982 59,479 61,530 76,473 84,970 92,295 118,958 127,455 152,946 178,437 184,590 254,910 297,395 356,874 382,365 535,311 594,790 764,730 892,185 1,070,622 1,784,370 2,676,555 and 5,353,110, with no remainder.
Since 5,353,110 cannot be divided by just 1 and 5,353,110, it is not a prime number.