How many 1962 Chevy where built?

There's no single answer to how many 1962 Chevrolets were built. Chevrolet produced several models in 1962 (Biscayne, Bel Air, Impala, etc., plus different body styles within those models – coupes, sedans, wagons, etc.). To get a precise number, you'd need to find production figures for *each* model and body style for that year, and even then, those figures might not be perfectly complete. Such data isn't readily available in a single, easily accessible location.