两百五十万 is a number meaning '2.5 million' (literally 'two hundred fifty ten-thousand'). In Chinese, large numbers are grouped by ten-thousands (万) rather than thousands, so 2.5 million is expressed as 两百五十万 (250 × 10,000). This is a common way to state amounts in finance, population, or statistics. Note that 两 (liǎng) is used instead of 二 (èr) for the hundreds digit here, which is standard in Chinese numerals.