28 Divide by two.
14,2 Divide by two.
7,2 2 Stop.
28 = 2 x 2 x 7
In exponent form, this is 22 x 7
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7,2,2 14,2 28
To find the prime factors of 28 start with any factor pair of 28 and keep factoring the composite factors until all the factors are prime. 28 2 x 14 2 x 2 x 7 The three prime factors of 28 are 2, 2, 7.
Their only prime factor is 4.
7
3 could be a prime factor but it depends on which number you're trying to find the prime factors of.