To identify which of the given options is irrational, let's analyze each of them:
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\( \sqrt{4} \): This equals 2, which is a rational number.
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\( \frac{\sqrt{3}}{4} \): Here, \( \sqrt{3} \) is an irrational number, and dividing an irrational number by a non-zero rational number results in an irrational number. Thus, \( \frac{\sqrt{3}}{4} \) is irrational.
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3.6363636363636363...: This represents a repeating decimal (3.63 with the "63" repeating). Repeating decimals are rational numbers. Thus, this is a rational number.
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−7837: This is an integer, which is a rational number.
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\( \frac{8}{37} \): This is a fraction of two integers, so it is a rational number.
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52.781654292: This is a finite decimal number, which is also a rational number.
From the analysis, \( \frac{\sqrt{3}}{4} \) is the only irrational number among the given options.