It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 264 401 638 is not a prime number.
For example, 264 401 638 can be divided by 2: 264 401 638 / 2 = 132 200 819.
For 264 401 638 to be a prime number, it would have been required that 264 401 638 has only two divisors, i.e., itself and 1.
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264 401 638 is an even number, because it is evenly divisible by 2: 264 401 638 / 2 = 132 200 819.
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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 264 401 638 is about 16 260.432.
Thus, the square root of 264 401 638 is not an integer, and therefore 264 401 638 is not a square number.
The square of a number (here 264 401 638) is the result of the product of this number (264 401 638) by itself (i.e., 264 401 638 × 264 401 638); the square of 264 401 638 is sometimes called "raising 264 401 638 to the power 2", or "264 401 638 squared".
The square of 264 401 638 is 69 908 226 177 083 040 because 264 401 638 × 264 401 638 = 264 401 6382 = 69 908 226 177 083 040.
As a consequence, 264 401 638 is the square root of 69 908 226 177 083 040.
264 401 638 is a number with 9 digits.
The multiples of 264 401 638 are all integers evenly divisible by 264 401 638, that is all numbers such that the remainder of the division by 264 401 638 is zero. There are infinitely many multiples of 264 401 638. The smallest multiples of 264 401 638 are: