Is it permissible to make an insurance and investment policy by paying a monthly amount for a long period, then receiving a multiplied amount at its end?

The questioner did not specify the type of transaction for which he pays an amount to receive multiples of it after a period. If he means investment certificates or savings accounts in usurious banks and the post office, then this transaction is a loan with interest, and not a permissible mudarabah (definition) (profit-sharing) or investment. Consequently, participation in it is forbidden. Similarly, commercial insurance contracts are forbidden, and it is not permissible to own anything from them except the premiums actually paid.