It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 264 126 is not a prime number.
For example, 264 126 can be divided by 2: 264 126 / 2 = 132 063.
For 264 126 to be a prime number, it would have been required that 264 126 has only two divisors, i.e., itself and 1.
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264 126 is an even number, because it is evenly divisible by 2: 264 126 / 2 = 132 063.
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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 264 126 is about 513.932.
Thus, the square root of 264 126 is not an integer, and therefore 264 126 is not a square number.
The square of a number (here 264 126) is the result of the product of this number (264 126) by itself (i.e., 264 126 × 264 126); the square of 264 126 is sometimes called "raising 264 126 to the power 2", or "264 126 squared".
The square of 264 126 is 69 762 543 876 because 264 126 × 264 126 = 264 1262 = 69 762 543 876.
As a consequence, 264 126 is the square root of 69 762 543 876.
The multiples of 264 126 are all integers evenly divisible by 264 126, that is all numbers such that the remainder of the division by 264 126 is zero. There are infinitely many multiples of 264 126. The smallest multiples of 264 126 are: