Taraweeh prayer is two by two rak’ahs

This action is not prescribed in sharee’ah, rather it is
makrooh or haraam according to most scholars, because the Prophet
(peace and blessings of Allaah be upon him) said: “The night prayers are two
by two.” Saheeh – agreed upon, from the hadeeth of Ibn ‘Umar (may Allaah be
pleased with him). And it is proven that ‘Aa’ishah (may Allaah be pleased
with her) said: The Prophet (peace and blessings of Allaah be upon him)
used to pray eleven rak’ahs at night, and say the tasleem after each two
rak’ahs, and he would pray Witr with one rak’ah. Saheeh, agreed upon. And
there are many similar ahaadeeth. 

With regard to the famous hadeeth of ‘Aa’ishah, which says
that “the Prophet (peace and blessings of Allaah be upon him) used to
pray four rak’ahs at night, and do not ask how beautiful and how long they
were, then he would pray four, and do not ask how beautiful and how long
they were”, the hadeeth is agreed upon – the answer is that he said the
tasleem after each two rak’ahs; it does not mean that he would follow four
rak’ahs with one salaam, because of the hadeeth quoted above. And it is
proven that he (peace and blessings of Allaah be upon him) said: “The
night prayers are two by two” as stated above. The ahaadeeth confirm one
another, so the Muslim is obliged to study all of them together and to
interpret those that are general in meaning by those that are more specific.
And Allaah is the Source of strength. End quote. 

Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allaah have mercy on
him)