Prime factorization, fundamental theorem of Arithmetic, unique fatorization theorem

Fundamental theorem of Arithmetic :-

Unique factorization theorem:- 

Every composite number can be expressed as a product

of primes, and  this factorization is unique, apart from

the order in which the prime  factors occur

                66 =2×3×11

               12 =2×2×3

                  15 =3×5

                   45 =3×3×5

N  is a composite number, 

p, q, r,...... are primes 

N=p.q.r.