It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 264 638 018 is not a prime number.
For example, 264 638 018 can be divided by 2: 264 638 018 / 2 = 132 319 009.
For 264 638 018 to be a prime number, it would have been required that 264 638 018 has only two divisors, i.e., itself and 1.
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264 638 018 is an even number, because it is evenly divisible by 2: 264 638 018 / 2 = 132 319 009.
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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 264 638 018 is about 16 267.699.
Thus, the square root of 264 638 018 is not an integer, and therefore 264 638 018 is not a square number.
The square of a number (here 264 638 018) is the result of the product of this number (264 638 018) by itself (i.e., 264 638 018 × 264 638 018); the square of 264 638 018 is sometimes called "raising 264 638 018 to the power 2", or "264 638 018 squared".
The square of 264 638 018 is 70 033 280 570 968 320 because 264 638 018 × 264 638 018 = 264 638 0182 = 70 033 280 570 968 320.
As a consequence, 264 638 018 is the square root of 70 033 280 570 968 320.
264 638 018 is a number with 9 digits.
The multiples of 264 638 018 are all integers evenly divisible by 264 638 018, that is all numbers such that the remainder of the division by 264 638 018 is zero. There are infinitely many multiples of 264 638 018. The smallest multiples of 264 638 018 are: