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Answer: 3 factors

The factors are 1, p and q only.
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A prime number  is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.

If n=p·q, where p and q are prime numbers, then you can see that

  • p is positive factor, because [tex]\dfrac{n}{p}=q;[/tex]
  • q is positive factor, because [tex]\dfrac{n}{q}=p;[/tex]
  • n is positive factor, because [tex]\dfrac{n}{n}=1;[/tex]
  • 1 is positive factor, because [tex]\dfrac{n}{1}=n.[/tex]

Last two factors are called trivial, because each natural number n (n>1) has these two factors.

Answer: 4 positive factors: 1, p, q, n.

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