This number is a prime.
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The number of rooted trees with 10 nodes and also the number of ways of arranging 9 nonoverlapping circles. [Beedassy]
The first occurrence of three consecutive multidigit prime values y0 of the fundamental solution pair (x0, y0) to Pellian x2 - Dy2 = 1 corresponding to prime values D as well: 5169602 - 516959*7192 = 1 ; 5285282 - 528527*7272 = 1 ; 5372882 - 537287*7332 = 1. [Beedassy]