mehrmals
several times
More than once; on several occasions.
Ich habe dir doch mehrmals gesagt, dass du die Tür abschließen sollst.
I told you several times to lock the door.

several times
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several times
More than once; on several occasions.
Ich habe dir doch mehrmals gesagt, dass du die Tür abschließen sollst.
I told you several times to lock the door.

The word is made up of 'mehr' (more) and 'Mal' (time/occasion) and literally means 'more than one time'. The ending '-s' is typical of some German adverbs.
Wir haben uns dieses Jahr mehrmals getroffen.
We met several times this year.
As an adverb, 'mehrmals' (several times) can stand flexibly in the sentence. In position 1, it emphasizes frequency. In the middle of the sentence, it usually stands directly after the conjugated verb.
Mehrmals habe ich versucht, dich anzurufen.
Several times I tried to call you.
'Mehrmals' (several times) describes an unspecified but repeated frequency. It is often combined with everyday actions such as 'fragen' (to ask), 'anrufen' (to call), 'sagen' (to say/tell), or 'versuchen' (to try).
Er hat mehrmals nach dir gefragt.
He asked about you several times.
again / back
'wieder' and 'mehrmals' both have to do with repetition. 'wieder' only says that something happens again or comes back; it does not have to be more than one additional time. 'mehrmals' clearly means: more than once, so two or more times. They can be confused when talking about repeated actions. If the only important thing is that something happens again, use 'wieder'. If the number of repetitions is important, 'mehrmals' is more precise.

Ruf bitte mehrmals an, wenn du ihn wegen der Arbeit nicht sofort erreichst.
Please call several times if you don't reach him right away about the work.
In der Werkstatt repariert Hannes das Fahrrad wieder vor dem Wochenende.
At the workshop, Hannes repairs the bicycle again before the weekend.