49
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
52 divided 11 = 4.7272727272727275
2548 dekagrams is 25,480,000mg
17.3333
6.5
0.0097
52
0.0248
208.6848
80.25