Their product.
The factors of 2548 are 1, 2, 4, 7, 13, 14, 26, 28, 49, 52, 91, 98, 182, 196, 364, 637, 1274, and 2548. Of those, the only ones that are prime are 2, 7, and 13.
5
2548 dekagrams is 25,480,000mg
52 divided 11 = 4.7272727272727275
0.8387
11.5385
17.3333
208.6848
52
78
6.5