1- Trend analysis: Higher prime numbers mean we are in an uptrend. When the bands are moving upward direction, the market has a Bullish Direction.
Lower and lower prime numbers mean we are in a downtrend. (If the bands are moving Downward direction)
2- Volatility:
Narrower bands mean stock price is less volatile.
Wider bands indicate share price is volatile.
3- Signals:
In an uptrend look for a spike down in prime band for a long position entry.
In a downtrend look for a spike up in a prime band for a short position entry. (Not my favourite scenario, though!)