Does a diabetic fasting number of 136 mean that the diabetes is well controlled?

Not exactly: You can't focus on just fasting sugar to determine how well controlled your diabetes is. Mealtime blood sugars are also very important. A 136 fasting blood sugar is not optimal. Normal fasting blood sugar is less than 100.

Not necessarily: The better test for diabetes control is the hemoglobin a1c, which measures one's average blood sugar over a period of time. The best value for the A1c is controversial, but generally, if one is a long-time diabetic on insulin, then one can aim for an A1c of < or = 7.0. If one is a new diabetic (diet-controlled or on oral med), then perhaps one can aim for < 6.5 or even perhaps < or = 5.6.