It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 516 423 is not a prime number.
For example, 1 516 423 can be divided by 541: 1 516 423 / 541 = 2 803.
For 1 516 423 to be a prime number, it would have been required that 1 516 423 has only two divisors, i.e., itself and 1.
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1 516 423 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 1 516 423 is about 1 231.431.
Thus, the square root of 1 516 423 is not an integer, and therefore 1 516 423 is not a square number.
The square of a number (here 1 516 423) is the result of the product of this number (1 516 423) by itself (i.e., 1 516 423 × 1 516 423); the square of 1 516 423 is sometimes called "raising 1 516 423 to the power 2", or "1 516 423 squared".
The square of 1 516 423 is 2 299 538 714 929 because 1 516 423 × 1 516 423 = 1 516 4232 = 2 299 538 714 929.
As a consequence, 1 516 423 is the square root of 2 299 538 714 929.
The multiples of 1 516 423 are all integers evenly divisible by 1 516 423, that is all numbers such that the remainder of the division by 1 516 423 is zero. There are infinitely many multiples of 1 516 423. The smallest multiples of 1 516 423 are: