A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2200548 can be evenly divided by 1 2 3 4 6 7 12 14 17 21 23 28 34 42 46 51 67 68 69 84 92 102 119 134 138 161 201 204 238 268 276 322 357 391 402 469 476 483 644 714 782 804 938 966 1,139 1,173 1,407 1,428 1,541 1,564 1,876 1,932 2,278 2,346 2,737 2,814 3,082 3,417 4,556 4,623 4,692 5,474 5,628 6,164 6,834 7,973 8,211 9,246 10,787 10,948 13,668 15,946 16,422 18,492 21,574 23,919 26,197 31,892 32,361 32,844 43,148 47,838 52,394 64,722 78,591 95,676 104,788 129,444 157,182 183,379 314,364 366,758 550,137 733,516 1,100,274 and 2,200,548, with no remainder.
Since 2,200,548 cannot be divided by just 1 and 2,200,548, it is not a prime number.