Passage: The Buginese people are an ethnic group—the most numerous of the three major linguistic and ethnic groups of South Sulawesi, in the southwestern province of Sulawesi, third largest island of Indonesia. The Austronesian ancestors of the Buginese people settled on Sulawesi around 2500 B.C.E. There is "historical linguistic evidence of some late Holocene immigration of Austronesian speakers to South Sulawesi from Taiwan"—which means that the Buginese have "possible ultimate ancestry in South China", and that as a result of this immigration, "there was an infusion of an exogenous population from China or Taiwan." Migration from South China by some of the paternal ancestors of the Buginese is also supported by studies of Human Y-chromosome DNA haplogroups. The Bugis in 1605 converted to Islam from Animism. Some Buginese have retained their pre-Islamic belief called Tolotang, and some Bugis converted to Christianity by means of marriage; but they have remained a minority.Despite the population numbering only around 6 million, the Buginese are a very powerful people and they have heavily influenced the politics in the present day states of Malaysia, Indonesia and Singapore. The sixth Prime Minister of Malaysia, Najib Razak and the current Vice President of Indonesia, Jusuf Kalla are both Buginese.

Question: Buginese people of indonesia have been around since when?
2500 B.C.E.