SmallBASIC syntax groups: 

Data function ISSTRING

20  ISSTRING (x)
Returns true if x is a string (and cannot be converted to a number).

See examples

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? ISSTRING(12)      :REM false
? ISSTRING("12")    :REM false
? ISSTRING("12E+2") :REM false
? ISSTRING("abc")   :REM true
? ISSTRING("1+2")   :REM true