Each output of a counter chip (also known as a divider chip) is a "divide-by-two." This means each output produces a frequency half the previous frequency. These are also called binary dividers as they always divide by two. Some dividers have a special circuit inside that makes the fourth output a "divide-by-10."
The first output is divide by 2
The next output is divide by 4
The next output is divide by 8
The next is divide by 16.
This is never mentioned in detail but sometimes the counter is classified as a divide by 1024 and this lets you know the number of "divide-by" stages. It goes, divide by: 2 ,4, 8, 16, 32, 64, 128, 256, etc.