How to find the maximum Product in Square Matrix by java

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In the following 20 × 20 square array, four numbers arranged diagonally are marked red.

The product of these four numbers is 26 × 63 × 78 × 14 = 1788696.

In this 20 × 20 square matrix, what is the maximum product of four adjacent numbers in the same direction (bottom to top, top to bottom, right to left, left to right, or diagonal)?

System.out.println (Summation_primes (2000000))

Analysis:

Add primes less than 2000000 through a loop.

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