A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7533792 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 28 32 36 37 42 48 56 63 72 74 84 96 101 111 112 126 144 148 168 202 222 224 252 259 288 296 303 333 336 404 444 504 518 592 606 666 672 707 777 808 888 909 1,008 1,036 1,184 1,212 1,332 1,414 1,554 1,616 1,776 1,818 2,016 2,072 2,121 2,331 2,424 2,664 2,828 3,108 3,232 3,552 3,636 3,737 4,144 4,242 4,662 4,848 5,328 5,656 6,216 6,363 7,272 7,474 8,288 8,484 9,324 9,696 10,656 11,211 11,312 12,432 12,726 14,544 14,948 16,968 18,648 22,422 22,624 24,864 25,452 26,159 29,088 29,896 33,633 33,936 37,296 44,844 50,904 52,318 59,792 67,266 67,872 74,592 78,477 89,688 101,808 104,636 119,584 134,532 156,954 179,376 203,616 209,272 235,431 269,064 313,908 358,752 418,544 470,862 538,128 627,816 837,088 941,724 1,076,256 1,255,632 1,883,448 2,511,264 3,766,896 and 7,533,792, with no remainder.
Since 7,533,792 cannot be divided by just 1 and 7,533,792, it is not a prime number.