It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 264 387 644 is not a prime number.
For example, 264 387 644 can be divided by 2: 264 387 644 / 2 = 132 193 822.
For 264 387 644 to be a prime number, it would have been required that 264 387 644 has only two divisors, i.e., itself and 1.
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264 387 644 is an even number, because it is evenly divisible by 2: 264 387 644 / 2 = 132 193 822.
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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 264 387 644 is about 16 260.001.
Thus, the square root of 264 387 644 is not an integer, and therefore 264 387 644 is not a square number.
The square of a number (here 264 387 644) is the result of the product of this number (264 387 644) by itself (i.e., 264 387 644 × 264 387 644); the square of 264 387 644 is sometimes called "raising 264 387 644 to the power 2", or "264 387 644 squared".
The square of 264 387 644 is 69 900 826 299 870 736 because 264 387 644 × 264 387 644 = 264 387 6442 = 69 900 826 299 870 736.
As a consequence, 264 387 644 is the square root of 69 900 826 299 870 736.
264 387 644 is a number with 9 digits.
The multiples of 264 387 644 are all integers evenly divisible by 264 387 644, that is all numbers such that the remainder of the division by 264 387 644 is zero. There are infinitely many multiples of 264 387 644. The smallest multiples of 264 387 644 are: