Is it Sexist?

Cristina • Cancer survivor (Hodgkin's lymphoma); hobbyist photographer/editor; Archaeology student at Johns Hopkins University; 22.
Is it sexist to say that a woman shouldn't be president based solely on the fact that she's a woman? 
This isn't a political debate. This is just me being curious as to what "being sexist" is, as I've seen many women on here, as well as men on the outside, say that a woman shouldn't be president. Thoughts? Again, this isn't about politics or Hillary Clinton, but just a woman president in general.

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