Is the number four more commonly said as 'yon or 'shi' in japan?

Question:

Answer:

When 4 is used as a number, almost always it is pronounced "yon."
ex: 4回　４番目　４丁目　４本　４通　４頭　４辺　
When 4 is used as a word combined with other kanji characters, it is oftentimes pronounced "shi."
四角形　四国　四季　四苦八苦　四面楚歌　四方八方　
note:
There is no rule without exceptions, no to mention.