2d string array

I have 2d string array named X[5][5].
If i put in X[2][3] text how to check that in X[2][3] is text...

example... if(in X[2][3] is text){
I believe the string class has an empty method.

if ( !X[2][3].empty() )
... string has at least a space

Thank you :)
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