what is the meamimg of "the integral multiple of charges in an electron.

 SI unit of charge is Coulomb. So, a charge distribution is always measured in Coulomb.  

 Quantization of charge states that the magnitude of charge on a body must be an integral multiple of the magnitude of charge of an electron.  

 The magnitude of the minimum charge a body can have is 1.6 × 10  ^-19  C. Charge of any other magnitude will always be an integral (1, 2, 3, 4, …..) multiple of the charge on the electron.  

 Now, ‘e’ is the magnitude of the charge on an electron. So e = 1.6 × 10  ^-19  C.  

 Thus, the charge on a charged-body is always, q = ne, where n = 1, 2, 3, 4, .......