Is each ancient poem of 4 to 7 sentences a quatrain?

A poem with only four sentences is a quatrain.

Quatrains, also called truncated sentences, broken sentences and quatrains, are short and pithy. It is a popular genre of Chinese poetry in the Tang Dynasty and belongs to a form of modern poetry. The word quatrains first appeared in the Qi and Liang Dynasties in the Southern Dynasties. There are four five-character and four-sentence poems in Chen's Poem on Yutai. I don't know the author's name, and the topic is "Ancient Jueju". At this time, quatrains refer to small poems with five words, four sentences and two rhymes, and do not require balance and harmony. Jue means "cut off", and the ancients used four poems with four quatrains to complete an ideological concept. There are two types of quatrains: quatrains and archaic styles. Rhythm only needs to be refined after the rise of rhythmic poetry. Ancient times existed long before the appearance of metrical poems.

According to the metrical pattern of poetry, quatrains can be divided into two categories: quatrains and quatrains. Quatrains appeared only after the rise of metrical poems, while ancient quatrains existed long before the appearance of metrical poems. Xu Ling, editor-in-chief of Chen Dynasty in the Southern Dynasties, is known as the "ancient quatrains". However, although this quatrain rhymes, it is relatively free, or it can be said that some poets are unwilling to be bound by meter. After the popularization of law, ancient quatrains are still in use and development. There were many five-character quatrains in ancient times, but few seven-character quatrains.

According to the number of words in each sentence, quatrains can be divided into five-character quatrains, six-character quatrains and seven-character quatrains, of which five or seven quatrains are the majority and six quatrains are few.

For example:

Quatrain

"Two orioles sing green willows, and egrets cover the sky."

My window framed the snow-covered western hills. My door often says "goodbye" to ships sailing eastward.