There are six columns in FRONT of the white house.
there are 147 Windows there are also 412 doors and 28 fire places and 7 stair cases
I don't think any one person named it the White House but it came in general use after it was painted white to cover the burn marks left by the British in 1812 when they set it on fire. In the 1800's...
5,265,300 according to WikiPedia
According to Arcamax.com the answer is 147 windows