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Factor tree Method:

 Step1: The first step in making a
factor tree is to find a pair of
factors whose product is the
number that we are factoring.

 Step 2: These two factors are
the first branching in the factor
tree. There are often several
different pairs of factors that we
could choose to begin the
process. The choice does not
matter; we may begin with any
two factors.

 Step 3: We repeat the process
with each factor until each
branch of the tree ends in a
prime.
 Step 4: Then the prime
factorization is complete

 Prime factorization of 144=
2 x 2 x 2 x 2 x 3 x 3