Resistance between data/Addr pins and GND ranges from 1k to 1M, is this normal?
Sounds plausible. You have to remember that when your IC is not powered, you may be measuring the resistance of its input protection diodes (which prevent the input pins exceeding the power supply) rather than the input circuitry itself.

So you cannot conclude from these measurements that there is any fault. However, if you are not using ESD-safe practices there is a risk of damaging the IC from the measurement process itself.

Now resistance above 10 megohms, or below 1 ohm, would be more worrying; they might indicate an open circuit or short circuit from bad soldering.