It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 15 424 is not a prime number.
For example, 15 424 can be divided by 2: 15 424 / 2 = 7 712.
For 15 424 to be a prime number, it would have been required that 15 424 has only two divisors, i.e., itself and 1.
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15 424 is an even number, because it is evenly divisible by 2: 15 424 / 2 = 7 712.
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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 15 424 is about 124.193.
Thus, the square root of 15 424 is not an integer, and therefore 15 424 is not a square number.
The square of a number (here 15 424) is the result of the product of this number (15 424) by itself (i.e., 15 424 × 15 424); the square of 15 424 is sometimes called "raising 15 424 to the power 2", or "15 424 squared".
The square of 15 424 is 237 899 776 because 15 424 × 15 424 = 15 4242 = 237 899 776.
As a consequence, 15 424 is the square root of 237 899 776.
The multiples of 15 424 are all integers evenly divisible by 15 424, that is all numbers such that the remainder of the division by 15 424 is zero. There are infinitely many multiples of 15 424. The smallest multiples of 15 424 are: