You're right. It is a laptop (the HQ part of the CPU name is only for laptop processors, it means it can load graphics quicker) but for all you know it could be an Octo-Core.

Never judge a CPU by it's GHz, GHz only show the amount of instructions it can execute in one second (1 GHz = 1,000,000,000 instructions a second so we need to do 2.4 x 1,000,000,000 x amount of cores it has, in this case 8 to work out how many calculations a second his CPU can do. It's 19,200,000,000 if it had 8 cores). Consider this, 1 strong man wouldn't be able to fight off 8 average men. A CPU works the same, if there's 8 cores then that separates the workload between them like having 8 men carrying something instead of 1.