A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1325184 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 17 21 24 28 29 32 34 42 48 51 56 58 64 68 84 87 96 102 112 116 119 128 136 168 174 192 203 204 224 232 238 272 336 348 357 384 406 408 448 464 476 493 544 609 672 696 714 812 816 896 928 952 986 1,088 1,218 1,344 1,392 1,428 1,479 1,624 1,632 1,856 1,904 1,972 2,176 2,436 2,688 2,784 2,856 2,958 3,248 3,264 3,451 3,712 3,808 3,944 4,872 5,568 5,712 5,916 6,496 6,528 6,902 7,616 7,888 9,744 10,353 11,136 11,424 11,832 12,992 13,804 15,232 15,776 19,488 20,706 22,848 23,664 25,984 27,608 31,552 38,976 41,412 45,696 47,328 55,216 63,104 77,952 82,824 94,656 110,432 165,648 189,312 220,864 331,296 441,728 662,592 and 1,325,184, with no remainder.
Since 1,325,184 cannot be divided by just 1 and 1,325,184, it is not a prime number.