prayer is a noun
Pray is the verb ("I pray when I go to church.") and prayer is the noun (We said a prayer for the safety of the troops.)
Which is correct prayer or prayers?
Technically, it should be singular "prayer" as the Muslim boy is saying his one prayer at one time, not many prayers. If he says one prayer, and then says another prayer after that, that is saying "prayers". If he says one prayer now, and will not say another one until later today, then "saying a prayer" is correct.
Is there a word prays?
To utter or address a prayer or prayers to a deity or an object of worship, often as an entreaty: people praying in the pews of the church; people praying for divine guidance; people praying for their loved ones. v.tr. 1.