A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9774816 can be evenly divided by 1 2 3 4 6 8 12 16 19 23 24 32 38 46 48 57 69 76 92 96 114 138 152 184 228 233 276 304 368 437 456 466 552 608 699 736 874 912 932 1,104 1,311 1,398 1,748 1,824 1,864 2,208 2,622 2,796 3,496 3,728 4,427 5,244 5,359 5,592 6,992 7,456 8,854 10,488 10,718 11,184 13,281 13,984 16,077 17,708 20,976 21,436 22,368 26,562 32,154 35,416 41,952 42,872 53,124 64,308 70,832 85,744 101,821 106,248 128,616 141,664 171,488 203,642 212,496 257,232 305,463 407,284 424,992 514,464 610,926 814,568 1,221,852 1,629,136 2,443,704 3,258,272 4,887,408 and 9,774,816, with no remainder.
Since 9,774,816 cannot be divided by just 1 and 9,774,816, it is not a prime number.