If you include fractions and decimals, then there are an
infinite number of such pairs, so they can't be listed.
If you're satisfied to limit the discussion to whole numbers,
then the pairs are:
1 x 55
5 x 11
-1 x -55
-5 x 11
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No, you should continue checking for factor pairs even if you find a pair that repeats. A repeating pair indicates that the number is not a prime number, but there may be other factor pairs that have not been identified yet. It is important to exhaust all possible factor pairs to ensure that all factors of the number are identified accurately.
1 x 61 is the only factor pair of 61.
The factor pairs of 260 are (260,1), (130,2), (65,4), (52,5), (26,10), and (20,13)