All composite numbers can be expressed as unique products of prime numbers. This is accomplished by dividing the original number and its factors by prime numbers until all the factors are prime. A factor tree can help you visualize this.
Example: 210
210 Divide by two.
105,2 Divide by three.
35,3,2 Divide by five.
7,5,3,2 Stop. All the factors are prime.
2 x 3 x 5 x 7 = 210
That's the prime factorization of 210.
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You could find factors of a number with the guess and check method. You could also type your number into a factor calculator and get your factors that way.
prime factorization each number is a part of the whole
ascending order
If completed correctly, the bottom branch of a factor tree will be the prime factorization of the number at the top.
756 = 22 × 33 × 7
77 = 7 × 11