2^4 x 3^2
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15 = 31*51
5^2
648 expressed as a product of its prime factors in index form is 2^3 times 3^4
The index notation of 294 is 2 x 3^5, where 2 is the base and 5 is the exponent. This means that 294 can be expressed as the product of 2 and 3 raised to the power of 5. In index notation, the number is broken down into its prime factors and expressed as a product of primes with corresponding exponents.
81 is 3 to the power 4.