c# - LINQ optimization using single query on collection of integers -

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i have list of integers below

list<int> mycollection = new list<int> { 2625 };

i checking below condition 

if(mycollection.count() == 1 && mycollection.any(number=> number == 2625)) {         // }

how can optimize query can include both conditions single query? note: mycollection may contain multiple elements hence have used any().

one obvious optimization use list instance properties:

if(mycollection.count == 1 && mycollection[0] == 2625)) {         // }

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