A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4611072 can be evenly divided by 1 2 3 4 6 8 12 16 19 24 32 38 48 57 64 76 79 96 114 128 152 158 192 228 237 256 304 316 384 456 474 512 608 632 768 912 948 1,024 1,216 1,264 1,501 1,536 1,824 1,896 2,432 2,528 3,002 3,072 3,648 3,792 4,503 4,864 5,056 6,004 7,296 7,584 9,006 9,728 10,112 12,008 14,592 15,168 18,012 19,456 20,224 24,016 29,184 30,336 36,024 40,448 48,032 58,368 60,672 72,048 80,896 96,064 121,344 144,096 192,128 242,688 288,192 384,256 576,384 768,512 1,152,768 1,537,024 2,305,536 and 4,611,072, with no remainder.
Since 4,611,072 cannot be divided by just 1 and 4,611,072, it is not a prime number.