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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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Find the prime factors of each. Prime factors of 10 are 2 and 5 Prime factors of 15 are 3 and 5 Multiply one number by the prime factors unique to the other: 10x3 or 15x2 =30
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Multiply prime numbers or prime factors to find their product.
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I assume you are asking how do you work out the factors of a prime number. A prime number by definition only has itself and 1 as factors.
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Either one will work. If you're listing factors, use factors. If you're using prime factorization, use prime factors.
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17 is a prime number because it has only two factors which are itself and one.
How do you figure out if a number is prime?
Work out if they have any factors, other than the number 1 and themselves. If they do not they are prime.
