Although people like to say every psalm is a division, this is not true. There are only 5 divisions of psalms.   The book of Psalms is divided into five books, with the fol … lowing divisions: Book 1 - Psalms 1-41 Book 2 - Psalms 42-72 Book 3 - Psalms 73-89 Book 4 - Psalms 90-106 Book 5 - Psalms 107-150.