Estimated Jewish population living in Europe in 2002: (source: "Quid.com")
1,570,000 if you include 19,000 from Turkey (depending on of what is your definition of "Europe")
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The Holocaust - that is, the Nazi genocide of the Jews - began in 1941. The number of Jews killed by the Nazis before the start of World War 2 was about:
(There were an estimated 9.5 million Jews in Europe when World War 2 started, so at that stage the percentage would have been relatively small).
The mass killings started later - with the use of mobile killing units from July 1941 onwards. Routine mass gassings began at Chelmno on 8 December 1941.
Of course, as is well known, by May 1945 about 6 million Jews had been slaughtered.
Just before the start of World War 2 there were an estimated 9.2 million Jews in Europe.
Around 9.5 million
505,000-512,000