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.
Yes, prime factorization is not an NP-complete problem. It is in fact in the complexity class NP, but it is not known to be NP-complete.
194 2 x 97 Since both 2 and 97 are prime numbers, the prime factorization tree is complete.
In actual fact, the prime factorization of 42 is not 21 x 2, as 21 is not a prime number. The complete prime factorization of 42 is 2 x 3 x 7.
Once your prime factorization is complete and you discover that there are no numbers in common, the GCF is one and the numbers are declared to be relatively prime.
When the bottom branch consists entirely of prime numbers.
As product of its prime factors: 3*3*5 = 45
The prime factorization of 39 is 3 and 13, as both are prime numbers. This means that 39 can be expressed as (3 \times 13). There are no other prime factors involved, making this the complete factorization.
1220 610,2 305,2,2 61,5,2,2
231 = 31*71*111
the prime facotrization of 154 is 12 times 3 times 5
No, 3x5x4 is not a prime factorization of 60. A prime factorization of 60 would consist of only prime numbers. The prime factorization of 60 is 2x2x3x5.
When all the factors are prime numbers, that's a prime factorization.