Does Matthew 6:7 imply that the Hail Mary is a vain repititous prayer?

…‘But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.’

My protestant friend is adamant that the Hail Mary is not biblical!

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**Recommended Reading:
*]Is repetitious prayer bad?
*]Vain Repetition
*]The Rosary

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