Initial hamzah can be a root consonant or a derived-form prefix.
FormRootHamzah status
أَكَلَأ ك لRoot, first position
سَأَلَس أ لRoot, middle position
قَرَأَق ر أRoot, final position
أَخْرَجَخ ر جAdded Form IV prefix
أَقَامَق و مAdded Form IV prefix, hollow root
An initial hamzah is insufficient by itself to classify a root as hamzated.