A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9702784 can be evenly divided by 1 2 4 7 8 13 14 16 17 26 28 32 34 49 52 56 64 68 91 98 104 112 119 128 136 182 196 208 221 224 238 272 343 364 392 416 442 448 476 544 637 686 728 784 832 833 884 896 952 1,088 1,274 1,372 1,456 1,547 1,568 1,664 1,666 1,768 1,904 2,176 2,548 2,744 2,912 3,094 3,136 3,332 3,536 3,808 4,459 5,096 5,488 5,824 5,831 6,188 6,272 6,664 7,072 7,616 8,918 10,192 10,829 10,976 11,648 11,662 12,376 13,328 14,144 15,232 17,836 20,384 21,658 21,952 23,324 24,752 26,656 28,288 35,672 40,768 43,316 43,904 46,648 49,504 53,312 71,344 75,803 81,536 86,632 93,296 99,008 106,624 142,688 151,606 173,264 186,592 198,016 285,376 303,212 346,528 373,184 570,752 606,424 693,056 746,368 1,212,848 1,386,112 2,425,696 4,851,392 and 9,702,784, with no remainder.
Since 9,702,784 cannot be divided by just 1 and 9,702,784, it is not a prime number.