It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 321 624 is not a prime number.
For example, 1 321 624 can be divided by 2: 1 321 624 / 2 = 660 812.
For 1 321 624 to be a prime number, it would have been required that 1 321 624 has only two divisors, i.e., itself and 1.
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1 321 624 is an even number, because it is evenly divisible by 2: 1 321 624 / 2 = 660 812.
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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 1 321 624 is about 1 149.619.
Thus, the square root of 1 321 624 is not an integer, and therefore 1 321 624 is not a square number.
The square of a number (here 1 321 624) is the result of the product of this number (1 321 624) by itself (i.e., 1 321 624 × 1 321 624); the square of 1 321 624 is sometimes called "raising 1 321 624 to the power 2", or "1 321 624 squared".
The square of 1 321 624 is 1 746 689 997 376 because 1 321 624 × 1 321 624 = 1 321 6242 = 1 746 689 997 376.
As a consequence, 1 321 624 is the square root of 1 746 689 997 376.
The multiples of 1 321 624 are all integers evenly divisible by 1 321 624, that is all numbers such that the remainder of the division by 1 321 624 is zero. There are infinitely many multiples of 1 321 624. The smallest multiples of 1 321 624 are: