According to the population density information, it is False that Vietnam is Southeast Asia's largest population center.
This is because Southeast Asia's largest population center is Indonesia, with a population of 273,523,615 people.
The second most populated center in this region is the Philippines, with a population of 109,581,078 people.
While Vietnam came third with a population of 97,338,579 people.
Hence, in this case, it is concluded that it is False that Vietnam is Southeast Asia's largest population center.
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