Multiples of 26 include 26, 52, 78 and 104. For them to be common, they need to be compared to another set of multiples.
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Multiples of 13 include 13, 26, 39 and so on. For them to be common, they need to be compared to another set of multiples.
They are all multiples.
There are no multiples of 26 in that range.
5 is a prime number. Neither 13 nor 26 are multiples of 5, so the only factor common to them all is 1.
Those are known as "common multiples". The smallest POSITIVE of these common multiples is called the "least common multiple".