A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1982016 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 27 31 32 36 37 48 54 62 64 72 74 93 96 108 111 124 144 148 186 192 216 222 248 279 288 296 333 372 432 444 496 558 576 592 666 744 837 864 888 992 999 1,116 1,147 1,184 1,332 1,488 1,674 1,728 1,776 1,984 1,998 2,232 2,294 2,368 2,664 2,976 3,348 3,441 3,552 3,996 4,464 4,588 5,328 5,952 6,696 6,882 7,104 7,992 8,928 9,176 10,323 10,656 13,392 13,764 15,984 17,856 18,352 20,646 21,312 26,784 27,528 30,969 31,968 36,704 41,292 53,568 55,056 61,938 63,936 73,408 82,584 110,112 123,876 165,168 220,224 247,752 330,336 495,504 660,672 991,008 and 1,982,016, with no remainder.
Since 1,982,016 cannot be divided by just 1 and 1,982,016, it is not a prime number.