How do I know if a partition is ext2, ext3, or ext4?

The option is to use blkid:

# blkid /dev/sda1 
/dev/sda1: UUID="625fa1fa-2785-4abc-a15a-bfcc498139d1" TYPE="ext2"

This recognizes most filesystem types and stuff like encrypted partitions.

You can also search for partitions with a given type:

# blkid -t TYPE=ext2
/dev/sda1: UUID="625fa1fa-2785-4abc-a15a-bfcc498139d1" TYPE="ext2" 
/dev/sdb1: UUID="b80153f4-92a1-473f-b7f6-80e601ae21ac" TYPE="ext2"
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