prove that 4^9 + 9^4 is a composite
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If you don't know that how to get that a number is a composite number, you have to check whether the number is divisible by any number. So, as the number 268705 is divisible by 5, it is a composite number. Therefore, 9^4+4^9 is a composite number. Hence proved.
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Use the Sophie Germain identity and you will get it
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