yeah the number is correct for the mic i also could not find it , probaly coz its a cheap mic. I know about cascading op amps but my problem with that is to understand a datasheet because a datasheet has so much information on it i dont know where i should look.Hi Gusmas
Google the term "gain bandwidth product" and you will find out why you have such a poor bandwidth. A solution will be to use several gain stages (as mentioned by rjenkins). If you cascade 3 stages with gain 10, you will get a total gain of 10*10*10.
Ps could not find your microphone on google, is the number correct?