bRes = IsNumber ( vExpr ) AS Boolean bRes = Number? ( vExpr ) AS Boolean
Returns if an expression is a number, i.e. if it is:
PRINT IsNumber(1) <hr>True
PRINT IsNumber(False) <hr>True
PRINT IsNumber(Pi) <hr>True
PRINT IsNumber(Now) <hr>False
PRINT IsNumber(NULL) <hr>False