1. "Look, Dad," said Harry, pointing to the huge sign at the roadside. "What a funny number." Greg smiled. "Just the population of this city, an ordinary 6-digit number," he said. "What's so odd about that?" "Something special," replied the boy. "It's exactly half the square of its last three figures." He was right, so what was that number?

Population 363411

Population 282752

Population 198826