A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1076922 can be evenly divided by 1 2 3 6 7 9 11 14 18 21 22 27 33 37 42 49 54 63 66 74 77 98 99 111 126 147 154 189 198 222 231 259 294 297 333 378 407 441 462 518 539 594 666 693 777 814 882 999 1,078 1,221 1,323 1,386 1,554 1,617 1,813 1,998 2,079 2,331 2,442 2,646 2,849 3,234 3,626 3,663 4,158 4,662 4,851 5,439 5,698 6,993 7,326 8,547 9,702 10,878 10,989 13,986 14,553 16,317 17,094 19,943 21,978 25,641 29,106 32,634 39,886 48,951 51,282 59,829 76,923 97,902 119,658 153,846 179,487 358,974 538,461 and 1,076,922, with no remainder.
Since 1,076,922 cannot be divided by just 1 and 1,076,922, it is not a prime number.