If your h-index score is 241, that means you have at least 241 papers/articles that have been cited by at least 241 other papers/articles.
Congratulations! That is a high h-index score.
Any database could measure an h-index from its citation data.
Currently, Web of Science and Scopus (look in Author Details) display it.
Dr. J. E. Hirsch created the h-index in the paper An index to quantify an individual’s scientific research output in 2005.
He asked and answered "How does one quantify the cumulative impact and relevance of an individual’s scientific research output?"
A scientist has index h if h of his or her Np papers have at least h citations each and the other (Np h) papers have h citations each.
Using the h-index:
Data that is used for citation measurements include: