A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4367748 can be evenly divided by 1 2 3 4 6 7 11 12 14 21 22 28 29 33 42 44 58 66 77 84 87 116 132 154 163 174 203 231 308 319 326 348 406 462 489 609 638 652 812 924 957 978 1,141 1,218 1,276 1,793 1,914 1,956 2,233 2,282 2,436 3,423 3,586 3,828 4,466 4,564 4,727 5,379 6,699 6,846 7,172 8,932 9,454 10,758 12,551 13,398 13,692 14,181 18,908 21,516 25,102 26,796 28,362 33,089 37,653 50,204 51,997 56,724 66,178 75,306 99,267 103,994 132,356 150,612 155,991 198,534 207,988 311,982 363,979 397,068 623,964 727,958 1,091,937 1,455,916 2,183,874 and 4,367,748, with no remainder.
Since 4,367,748 cannot be divided by just 1 and 4,367,748, it is not a prime number.