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Can a rogue detect/disarm a stone of alarm?
I'm thinking that as it is based on a basic alarm spell, then yes, at DC 26 (25 + spell level), but I'm not sure.
No, it isn't a magic trap. Neither is alarm. As I understand the rules magic traps (at least in the CRB) call out they are magic traps - such as explosive runes
dragonhunterq is right. It is not a trap and as such is not detected like one (meaning Trap-spotter or Find traps will likely not stop you from setting it off if you say you're going to touch the object.)
The plus-side (from the touchy-feely person's poit-of-view) is that technically anyone can note the presence of the stone if it's visible (ie. not affixed to the other side of a door). So a detect magic or simple observation will reveal it and then a dispel magic or similar effect could suppress it or a silence spell could negate the audible alarm if you can recognize the stone for what it is.
You never need to be a rogue or have any special ability to find magical traps. It is a perception check anyone can make.
In the case of Alarm and similar spells, they are not traps. Detect Magic will readily find Alarm, along with the vast majority of magical traps.