Question

What are some simple shortcuts to finding the number of factors that a number has?

Not what all the factors are, but how many factors there are to that number.
And, please make it simple but short and understandable.

Answer 1

There are no shortcuts, but there are ways by which one can identify, whether a given number is divisible by a prime number or not, which helps in factorizing a number. However, this is only for smaller numbers, say up to `10` and though divisibity methods have been devised for larger numbers too, they tend to become somewhat difficult to follow.

Answer 2

See video.

Explanation:

This video may be of interest:

video