A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4708224 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 32 36 48 61 64 67 72 96 122 128 134 144 183 192 201 244 268 288 366 384 402 488 536 549 576 603 732 804 976 1,072 1,098 1,152 1,206 1,464 1,608 1,952 2,144 2,196 2,412 2,928 3,216 3,904 4,087 4,288 4,392 4,824 5,856 6,432 7,808 8,174 8,576 8,784 9,648 11,712 12,261 12,864 16,348 17,568 19,296 23,424 24,522 25,728 32,696 35,136 36,783 38,592 49,044 65,392 70,272 73,566 77,184 98,088 130,784 147,132 196,176 261,568 294,264 392,352 523,136 588,528 784,704 1,177,056 1,569,408 2,354,112 and 4,708,224, with no remainder.
Since 4,708,224 cannot be divided by just 1 and 4,708,224, it is not a prime number.