A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3474432 can be evenly divided by 1 2 3 4 6 8 9 12 13 16 18 24 26 29 32 36 39 48 52 58 64 72 78 87 96 104 116 117 128 144 156 174 192 208 232 234 256 261 288 312 348 377 384 416 464 468 512 522 576 624 696 754 768 832 928 936 1,024 1,044 1,131 1,152 1,248 1,392 1,508 1,536 1,664 1,856 1,872 2,088 2,262 2,304 2,496 2,784 3,016 3,072 3,328 3,393 3,712 3,744 4,176 4,524 4,608 4,992 5,568 6,032 6,656 6,786 7,424 7,488 8,352 9,048 9,216 9,984 11,136 12,064 13,312 13,572 14,848 14,976 16,704 18,096 19,968 22,272 24,128 27,144 29,696 29,952 33,408 36,192 39,936 44,544 48,256 54,288 59,904 66,816 72,384 89,088 96,512 108,576 119,808 133,632 144,768 193,024 217,152 267,264 289,536 386,048 434,304 579,072 868,608 1,158,144 1,737,216 and 3,474,432, with no remainder.
Since 3,474,432 cannot be divided by just 1 and 3,474,432, it is not a prime number.