@staticmethod
    def Mul(expr, assumptions):
        if expr.is_number:
            return AskIntegerHandler._number(expr, assumptions)
        _output = True
        for arg in expr.args:
            if not ask(Q.integer(arg), assumptions):
                if arg.is_Rational:
                    if arg.q == 2:
                        return ask(Q.even(2*expr), assumptions)
                    if ~(arg.q & 1):
                        return None
                elif ask(Q.irrational(arg), assumptions):
                    if _output:
                        _output = False
                    else:
                        return
                else:
                    return
        else:
            return _output
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