Syntax: @ISSTRING(X)
X = a numeric value
@ISSTRING returns 1 if X is a string value, otherwise 0. Blank cells are considered numeric.
Examples:
@ISSTRING(C10) = 1, where C10 = ``Total''
@ISSTRING(D10) = 0, where D10 = $1000.00
@ISSTRING(A1)= 0, where A1 is blank