Blood sugar of 110 about 4 hours after eating.. is this a sign of diabetes ?

No: That is a normal blood sugar. The diagnosis of diabetes is made when your fasting blood sugar is greater than 126 mg/dl or a random blood sugar is greater than 200 mg/dl on 2 separate occasions unless accompanied by symptoms of diabetes. Symptoms of diabetes can include increased thirst and urination. Unexplained weight loss, fatigue, blurred vision, or increased hunger.

Probably not: But official criteria for normal is <140, 2 hours after eating.