You start finding one factor. Divide by that factor, to get another factor. Continue looking for smaller factors, until you only have prime numbers.
For numbers up to 120, it is enough to check the prime factors 2, 3, 5, and 7.
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98 49,2 7,7,2
2 x 7 x 7 = 98
Prime factors of 70: 2, 5 and 7 Prime factors of 98: 2, 7 and 7
Yes, its prime factorization is 2*7*7
103 is already prime, no need for a factorization.