It depends the form the money took. Was it a portion of the money that already belonged to you and/or your ex? If so, then no. It is not income. Is it alimony? See the link below. If you got a portion of his 401k or pension, then yes, as it will be income.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/other-articles/need-report-alimony-recei...
