It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 265 516 018 is not a prime number.
For example, 265 516 018 can be divided by 2: 265 516 018 / 2 = 132 758 009.
For 265 516 018 to be a prime number, it would have been required that 265 516 018 has only two divisors, i.e., itself and 1.
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265 516 018 is an even number, because it is evenly divisible by 2: 265 516 018 / 2 = 132 758 009.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 265 516 018 is about 16 294.662.
Thus, the square root of 265 516 018 is not an integer, and therefore 265 516 018 is not a square number.
The square of a number (here 265 516 018) is the result of the product of this number (265 516 018) by itself (i.e., 265 516 018 × 265 516 018); the square of 265 516 018 is sometimes called "raising 265 516 018 to the power 2", or "265 516 018 squared".
The square of 265 516 018 is 70 498 755 814 576 320 because 265 516 018 × 265 516 018 = 265 516 0182 = 70 498 755 814 576 320.
As a consequence, 265 516 018 is the square root of 70 498 755 814 576 320.
265 516 018 is a number with 9 digits.
The multiples of 265 516 018 are all integers evenly divisible by 265 516 018, that is all numbers such that the remainder of the division by 265 516 018 is zero. There are infinitely many multiples of 265 516 018. The smallest multiples of 265 516 018 are: