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It is give (your name) 92.
Surround it with torches, which will stop anything from spawning, then simply destroy it with a pick.
The block id is 52. By default, it will be a pig spawner, so it is better that you use a mod like single player commands to change it
You need to find natural dungeons or caves. There will be a chance that a monster spawner will be in there.
It is impossible to obtain the "MobSpawner" block without the use of mods or inventory editors.