A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1482264 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 17 18 21 24 28 34 36 42 51 56 63 68 72 84 102 119 126 136 153 168 173 204 238 252 306 346 357 408 476 504 519 612 692 714 952 1,038 1,071 1,211 1,224 1,384 1,428 1,557 2,076 2,142 2,422 2,856 2,941 3,114 3,633 4,152 4,284 4,844 5,882 6,228 7,266 8,568 8,823 9,688 10,899 11,764 12,456 14,532 17,646 20,587 21,798 23,528 26,469 29,064 35,292 41,174 43,596 52,938 61,761 70,584 82,348 87,192 105,876 123,522 164,696 185,283 211,752 247,044 370,566 494,088 741,132 and 1,482,264, with no remainder.
Since 1,482,264 cannot be divided by just 1 and 1,482,264, it is not a prime number.