Is it obligatory to repeat the prayer if I ate after performing ablution and prayed without rinsing my mouth, and is it obligatory to interrupt the prayer upon remembering that during it?

Rinsing the mouth after eating is recommended for those who have consumed fatty foods, but it is not obligatory. Their prayer is valid even if they do not rinse their mouth. It is not permissible for them to interrupt a mandatory prayer for this reason, and it is disliked for them to interrupt a supererogatory prayer.