No. The so-called "natural" logarithms have a base of ' e ', and you can find
the log of any positive number to any base you like.
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Logarithms can be taken to any base. Common logarithms are logarithms taken to base 10; it is sometimes abbreviated to lg. Natural logarithms are logarithms taken to base e (= 2.71828....); it is usually abbreviated to ln.
The base 10 logarithm is called the "common logarithm". * * * * * It is also called the 'Briggsian logarithm', named after Henry Briggs, who introduced his table of logarithms on base 10 at Oxford in 1624, much to the joy of navigators, astronomers, and others having tedious calculations to perform.
You could take logarithms to base 10.
Natural logarithms use base e (approximately 2.71828), common logarithms use base 10.
To which base? To base e (natural logarithms) loge 589 ~= 6.378 To base 10 (common logarithms) log10 589 ~= 2.77 To base 2 (a base I quite like) log2 589 ~= 9.202