A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9032904 can be evenly divided by 1 2 3 4 6 8 9 12 18 19 24 27 31 36 38 54 57 62 71 72 76 93 108 114 124 142 152 171 186 213 216 228 248 279 284 342 372 426 456 513 558 568 589 639 684 744 837 852 1,026 1,116 1,178 1,278 1,349 1,368 1,674 1,704 1,767 1,917 2,052 2,201 2,232 2,356 2,556 2,698 3,348 3,534 3,834 4,047 4,104 4,402 4,712 5,112 5,301 5,396 6,603 6,696 7,068 7,668 8,094 8,804 10,602 10,792 12,141 13,206 14,136 15,336 15,903 16,188 17,608 19,809 21,204 24,282 26,412 31,806 32,376 36,423 39,618 41,819 42,408 48,564 52,824 59,427 63,612 72,846 79,236 83,638 97,128 118,854 125,457 127,224 145,692 158,472 167,276 237,708 250,914 291,384 334,552 376,371 475,416 501,828 752,742 1,003,656 1,129,113 1,505,484 2,258,226 3,010,968 4,516,452 and 9,032,904, with no remainder.
Since 9,032,904 cannot be divided by just 1 and 9,032,904, it is not a prime number.