Prime factorization for 50

Since '50' is an even number; its ends in '0' . Then use the lowest Prime number '2'.

Hence

2)50 = 25

Since '3' will not divide into '25' , then try '5'

5)25 - 5

5)5 = 1

So the prime factors of '50' are 2,5,5, because '2' & '5' are both prime numbers.