No, the capital is Ankara :-) It was Istanbul till the born of republic when the father of modern Turkey: Mustafa Kemal Atatürk moved it to Ankara.
Turkish Delight/ lokum, Black Rose from Halfeti, Tulip Festival, Blue Mosque/ Sultan Ahmet Mosque, Istanbul was Constantinopel, NFK, and Mehmed Akif Ersoy.
Sellers in shops are very intrusive. I was vacationing in Kemer
The capital is Instanbul.