How much shares of a company listed on BSE/NSE we can buy?

Example:
A company has market cap of 5.4 crores & each share is of Rs. 0.5
Then how many shares i can buy???
Is it possible that i can buy 10000000 shares at a time…
Are they readily available OR i have to wait OR is there any other condition???
Please tell me…

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how does a company get listed on bse/nse