A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1745184 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 21 24 28 32 42 48 49 53 56 84 96 98 106 112 147 159 168 196 212 224 294 318 336 343 371 392 424 588 636 672 686 742 784 848 1,029 1,113 1,176 1,272 1,372 1,484 1,568 1,696 2,058 2,226 2,352 2,544 2,597 2,744 2,968 4,116 4,452 4,704 5,088 5,194 5,488 5,936 7,791 8,232 8,904 10,388 10,976 11,872 15,582 16,464 17,808 18,179 20,776 31,164 32,928 35,616 36,358 41,552 54,537 62,328 72,716 83,104 109,074 124,656 145,432 218,148 249,312 290,864 436,296 581,728 872,592 and 1,745,184, with no remainder.
Since 1,745,184 cannot be divided by just 1 and 1,745,184, it is not a prime number.