It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 249 264 is not a prime number.
For example, 1 249 264 can be divided by 2: 1 249 264 / 2 = 624 632.
For 1 249 264 to be a prime number, it would have been required that 1 249 264 has only two divisors, i.e., itself and 1.
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1 249 264 is an even number, because it is evenly divisible by 2: 1 249 264 / 2 = 624 632.
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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 1 249 264 is about 1 117.705.
Thus, the square root of 1 249 264 is not an integer, and therefore 1 249 264 is not a square number.
The square of a number (here 1 249 264) is the result of the product of this number (1 249 264) by itself (i.e., 1 249 264 × 1 249 264); the square of 1 249 264 is sometimes called "raising 1 249 264 to the power 2", or "1 249 264 squared".
The square of 1 249 264 is 1 560 660 541 696 because 1 249 264 × 1 249 264 = 1 249 2642 = 1 560 660 541 696.
As a consequence, 1 249 264 is the square root of 1 560 660 541 696.
The multiples of 1 249 264 are all integers evenly divisible by 1 249 264, that is all numbers such that the remainder of the division by 1 249 264 is zero. There are infinitely many multiples of 1 249 264. The smallest multiples of 1 249 264 are: