A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2513472 can be evenly divided by 1 2 3 4 6 8 12 13 16 19 24 26 32 38 39 48 52 53 57 64 76 78 96 104 106 114 152 156 159 192 208 212 228 247 304 312 318 416 424 456 494 608 624 636 689 741 832 848 912 988 1,007 1,216 1,248 1,272 1,378 1,482 1,696 1,824 1,976 2,014 2,067 2,496 2,544 2,756 2,964 3,021 3,392 3,648 3,952 4,028 4,134 5,088 5,512 5,928 6,042 7,904 8,056 8,268 10,176 11,024 11,856 12,084 13,091 15,808 16,112 16,536 22,048 23,712 24,168 26,182 32,224 33,072 39,273 44,096 47,424 48,336 52,364 64,448 66,144 78,546 96,672 104,728 132,288 157,092 193,344 209,456 314,184 418,912 628,368 837,824 1,256,736 and 2,513,472, with no remainder.
Since 2,513,472 cannot be divided by just 1 and 2,513,472, it is not a prime number.