A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1454544 can be evenly divided by 1 2 3 4 6 7 8 9 12 13 14 16 18 21 24 26 27 28 36 37 39 42 48 52 54 56 63 72 74 78 84 91 104 108 111 112 117 126 144 148 156 168 182 189 208 216 222 234 252 259 273 296 312 333 336 351 364 378 432 444 468 481 504 518 546 592 624 666 702 728 756 777 819 888 936 962 999 1,008 1,036 1,092 1,332 1,404 1,443 1,456 1,512 1,554 1,638 1,776 1,872 1,924 1,998 2,072 2,184 2,331 2,457 2,664 2,808 2,886 3,024 3,108 3,276 3,367 3,848 3,996 4,144 4,329 4,368 4,662 4,914 5,328 5,616 5,772 6,216 6,552 6,734 6,993 7,696 7,992 8,658 9,324 9,828 10,101 11,544 12,432 12,987 13,104 13,468 13,986 15,984 17,316 18,648 19,656 20,202 23,088 25,974 26,936 27,972 30,303 34,632 37,296 39,312 40,404 51,948 53,872 55,944 60,606 69,264 80,808 90,909 103,896 111,888 121,212 161,616 181,818 207,792 242,424 363,636 484,848 727,272 and 1,454,544, with no remainder.
Since 1,454,544 cannot be divided by just 1 and 1,454,544, it is not a prime number.