A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5348430 can be evenly divided by 1 2 3 5 6 9 10 15 18 27 30 31 45 54 62 71 81 90 93 135 142 155 162 186 213 243 270 279 310 355 405 426 465 486 558 639 710 810 837 930 1,065 1,215 1,278 1,395 1,674 1,917 2,130 2,201 2,430 2,511 2,790 3,195 3,834 4,185 4,402 5,022 5,751 6,390 6,603 7,533 8,370 9,585 11,005 11,502 12,555 13,206 15,066 17,253 19,170 19,809 22,010 25,110 28,755 33,015 34,506 37,665 39,618 57,510 59,427 66,030 75,330 86,265 99,045 118,854 172,530 178,281 198,090 297,135 356,562 534,843 594,270 891,405 1,069,686 1,782,810 2,674,215 and 5,348,430, with no remainder.
Since 5,348,430 cannot be divided by just 1 and 5,348,430, it is not a prime number.