A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5100084 can be evenly divided by 1 2 3 4 6 9 11 12 18 22 27 33 36 44 53 54 66 81 99 106 108 132 159 162 198 212 243 297 318 324 396 477 486 583 594 636 729 891 954 972 1,166 1,188 1,431 1,458 1,749 1,782 1,908 2,187 2,332 2,673 2,862 2,916 3,498 3,564 4,293 4,374 5,247 5,346 5,724 6,996 8,019 8,586 8,748 10,494 10,692 12,879 15,741 16,038 17,172 20,988 24,057 25,758 31,482 32,076 38,637 47,223 48,114 51,516 62,964 77,274 94,446 96,228 115,911 141,669 154,548 188,892 231,822 283,338 425,007 463,644 566,676 850,014 1,275,021 1,700,028 2,550,042 and 5,100,084, with no remainder.
Since 5,100,084 cannot be divided by just 1 and 5,100,084, it is not a prime number.