No, ‘had’ is not a preposition. It is actually the past tense of the verb ‘have’. In English, prepositions are words that indicate relationships between other words, often related to time, place, or direction, such as ‘in’, ‘on’, ‘at’, and ‘with’.
‘Had’ serves as a main verb or an auxiliary verb in sentences. For example, in the sentence ‘I had a great time at the party’, ‘had’ is used to indicate possession in the past. In another context, ‘had’ can function as an auxiliary verb in perfect tenses, as in ‘I had eaten before they arrived’, where it helps to form the past perfect tense.
In summary, ‘had’ does not fit the definition of a preposition because it does not serve to link nouns or pronouns to other words in terms of time, place, or direction. Instead, it acts as a verb indicating something that was possessed or an action that was completed before another action in the past.