Do all guitars have 6 strings?

A little bit of guitar history today. This post is made up of a bunch of paragraphs from Wikipedia.
“The guitar is a musical instrument with ancient roots that’s used in a wide variety of musical styles. It typically has six strings, but four, seven, eight, ten, and twelve string guitars also exist.
The tenor guitar is a slightly smaller, four-string version of the steel-string acoustic guitar or electric guitar. The instrument (in its acoustic form) was developed so that players of the four-string tenor banjo could double on the guitar. Later, solid-body electric models were also produced.
A seven-string guitar is a guitar with seven strings instead of the usual six. Such guitars are not as common as the six string variety but a minority of guitarists have utilised them for at least 150 years. Some types of these instruments are specific to certain cultures (for example the Russian and Brazilian guitars).
The twelve string guitar is an acoustic or electric guitar with twelve strings, which produces a richer, more ringing tone than a standard six string guitar. Essentially, it’s a type of guitar with a natural chorus effect due to the subtle differences in string timbre.
The strings are placed in courses of two strings each that are usually played together. The two strings in each bass course are normally tuned an octave apart, while each pair of strings in the treble courses is tuned in unison. The tuning of the second string in the third course (G) varies: some players use a unison string which is less prone to breakage, others prefer the distinctive high-pitched, bell-like quality an octave string makes in this position.”

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