It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 665 513 is not a prime number.
For example, 665 513 can be divided by 19: 665 513 / 19 = 35 027.
For 665 513 to be a prime number, it would have been required that 665 513 has only two divisors, i.e., itself and 1.
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665 513 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 665 513 is about 815.790.
Thus, the square root of 665 513 is not an integer, and therefore 665 513 is not a square number.
The square of a number (here 665 513) is the result of the product of this number (665 513) by itself (i.e., 665 513 × 665 513); the square of 665 513 is sometimes called "raising 665 513 to the power 2", or "665 513 squared".
The square of 665 513 is 442 907 553 169 because 665 513 × 665 513 = 665 5132 = 442 907 553 169.
As a consequence, 665 513 is the square root of 442 907 553 169.
The multiples of 665 513 are all integers evenly divisible by 665 513, that is all numbers such that the remainder of the division by 665 513 is zero. There are infinitely many multiples of 665 513. The smallest multiples of 665 513 are: