Does the position of the maximum value of the amplitude spectrum of several periods of the sine coincide with the frequency of the sine?

Question

Fourier transform

I set four sine periods in Scilab with a frequency of 33 kHz. I add a certain number of zeros to the four periods of the sine. I apply the Fourier transform and build the amplitude spectrum. The maximum value of the spectrum is approximately at a frequency of 32.7 kHz. Those. not 33 kHz. Is that how it should be? Does the maximum value of the spectrum correspond to the center frequency?