It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 340 644 is not a prime number.
For example, 340 644 can be divided by 2: 340 644 / 2 = 170 322.
For 340 644 to be a prime number, it would have been required that 340 644 has only two divisors, i.e., itself and 1.
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340 644 is an even number, because it is evenly divisible by 2: 340 644 / 2 = 170 322.
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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 340 644 is about 583.647.
Thus, the square root of 340 644 is not an integer, and therefore 340 644 is not a square number.
The square of a number (here 340 644) is the result of the product of this number (340 644) by itself (i.e., 340 644 × 340 644); the square of 340 644 is sometimes called "raising 340 644 to the power 2", or "340 644 squared".
The square of 340 644 is 116 038 334 736 because 340 644 × 340 644 = 340 6442 = 116 038 334 736.
As a consequence, 340 644 is the square root of 116 038 334 736.
The multiples of 340 644 are all integers evenly divisible by 340 644, that is all numbers such that the remainder of the division by 340 644 is zero. There are infinitely many multiples of 340 644. The smallest multiples of 340 644 are: