Definitely. The silverfish spawner is one of the most useless things in Minecraft. Destroying the spawner gives you some XP and stops some of the silverfish spawning (just don't dig up the area too much). The only real reason to go into a stronghold is to get to the end.

Can I break the silverfish spawner?

If you want to deactivate a silverfish spawner, it is simplicity once you know it spawns in a 9x9x3 area and requires the light to be above 12. Remember that the portal blocks are modeled after glass and are transparent. This configuration requires 13 JackOLanterns, 3 torches, and some dirt.

Why is there a silverfish spawner in the stronghold?

Silverfish spawn from broken infested blocks, which generate in strongholds, underground in mountains biomes, igloo basements and woodland mansion false portal rooms. Silverfish do not appear if the block is broken with the Silk Touch enchantment. ... This is the only renewable source of silverfish and infested blocks.