what is the number of wars there have been throughout history?

To get anything like an accurate answer to this question, you'd have
to define "wars" (when does a conflict become a war etc), history
(recorded history, or including non-recorded); and you might even have
to define "hunan" (assuming you go along with evolutioniary
principles). In the absence of those definitions, the only answer
you'll probably come up with is "an awful lot".

This will probably only add to your frustration, but... I was filling
in time in an Australian public library and found an A4 size book,
green cover,  which listed every(?) war since about 3,000BC.  It
detailed when,  where and who... but I cannot remember its name.    As
a 70-year-old I'm reminded of the saying " of all the things I've lost
I miss my mind the most"

 I once Googled "wars involing the US"   From memory, it was over 70.
It counted the wars between the eastern states and the various
Indian(sorry native americans) as well as several battles with the
british, as individual wars.   A few of them puzzled me... what were
the Yanks doing beating up some North African tribe in the 1800's.

Pademelon,
In N. Africa, I think they were fighting a war against pirates  -
well, against those who felt it was an acceptable pursuit.  The US
Marine Corps Hymn has a line:  "From the halls of Montezuma to the
shores of Tripoli".