You are correct in saying 6 rows. Starting with row 0, the kth row has the numbers C(k, 0) C(k, 1) C(k, 2) ... C(k, k). For every number in the row to be even, k must only have even factors, so it must be a power of 2. Since the highest power of 2 under 100 is 2^6, 6 of the first 100 rows have only even numbers besides 1.
+210 
LOL!