It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 264 147 is not a prime number.
For example, 1 264 147 can be divided by 709: 1 264 147 / 709 = 1 783.
For 1 264 147 to be a prime number, it would have been required that 1 264 147 has only two divisors, i.e., itself and 1.
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1 264 147 is an odd number, because it is not evenly divisible by 2.
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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 1 264 147 is about 1 124.343.
Thus, the square root of 1 264 147 is not an integer, and therefore 1 264 147 is not a square number.
The square of a number (here 1 264 147) is the result of the product of this number (1 264 147) by itself (i.e., 1 264 147 × 1 264 147); the square of 1 264 147 is sometimes called "raising 1 264 147 to the power 2", or "1 264 147 squared".
The square of 1 264 147 is 1 598 067 637 609 because 1 264 147 × 1 264 147 = 1 264 1472 = 1 598 067 637 609.
As a consequence, 1 264 147 is the square root of 1 598 067 637 609.
The multiples of 1 264 147 are all integers evenly divisible by 1 264 147, that is all numbers such that the remainder of the division by 1 264 147 is zero. There are infinitely many multiples of 1 264 147. The smallest multiples of 1 264 147 are: