2 has two factors.
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=3 factors=
If they are prime numbers only 2 factors but if they are composite number they will have more than 2 factors
There are only 2 prime factors for 72. They are 2 and 3, since 72 = 2X2X2X3X3. Therefore, the 2 prime factors for 72 are 2 and 3.
The positive integer factors of 28 are: 1, 2, 4, 7, 14, 28
factors of 16 - 1, 2, 4, 8, 16 total of 5 factors