The Prelude may be classed somewhat loosely as an epic; it does not satisfy all the traditional qualifications of that genre. The epic is customarily defined as a long narrative poem which recounts heroic actions.
commonly legendary or historical, and usually of one principal hero (from whence it derives its unity). The Prelude take its unity from the fact that the central “hero” is its author
The poem is written blank verse, unrhymed lines of iambic pentameter with certain permissible substitutions of trochees and anapests to relieve the monotony of the iambic foot and with total disregard for the stanza from.
In the middle of the eighteenth century, there was an eclipse of interest in the rhymed heroic couplet. A revival of interest in Milton led to the establishment of Miltonic blank verse as the standard medium for lengthy philosophical or didactic poetical works.
The resulting form came to be called the “literary” epic as opposed to heroic and folk epic. To this type, Wordsworth, with his unconventional ideas of diction brought a natural and conversational tone.