Chapter 2 of Class 6 Mathematics, "Playing with Numbers," explores fundamental concepts of numbers and their properties. Students will be introduced to multiples and factors, learning how to identify and utilize them. The chapter delves into perfect numbers and distinguishes between prime and composite numbers, including the historical Sieve of Eratosthenes method for identifying primes. Key divisibility rules are presented to simplify calculations. The chapter also covers the Highest Common Divisor (H.C.F) and Least Common Multiple (L.C.M), highlighting their significance and the relationship between them. By the end of this chapter, students will have a solid understanding of these essential number concepts, laying a strong foundation for further mathematical learning.