I read someone said it is & it was my first time ive known it, but i still have doubts about it.
closed as unclear what you're asking by Azik Abdullah, Zahra Ezati, مجاهد Jun 21 '14 at 15:16
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No it's not true. You can ask for forgiveness once and that can be good enough.
There's no specific number mentioned. May be the person who told you about the 100 times a day thing mixed it with a hadith of the Prophet =
"A cloudiness comes over my heart, I seek forgiveness from Allah a hundred times a day."