How do you find the prime factorization of 196?
As the last two digits in
but factors of
Hence prime factors of
Note : This method of factorization, in which we first find identifiable factors and then proceed until all prime factors are known is called tree method. This is graphically described below.
It is really useful to know the square numbers up to
You would then recognise
If you do not know the square numbers, you have to work it out by dividing by the prime factors.