It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 216 238 is not a prime number.
For example, 216 238 can be divided by 2: 216 238 / 2 = 108 119.
For 216 238 to be a prime number, it would have been required that 216 238 has only two divisors, i.e., itself and 1.
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216 238 is an even number, because it is evenly divisible by 2: 216 238 / 2 = 108 119.
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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 216 238 is about 465.014.
Thus, the square root of 216 238 is not an integer, and therefore 216 238 is not a square number.
The square of a number (here 216 238) is the result of the product of this number (216 238) by itself (i.e., 216 238 × 216 238); the square of 216 238 is sometimes called "raising 216 238 to the power 2", or "216 238 squared".
The square of 216 238 is 46 758 872 644 because 216 238 × 216 238 = 216 2382 = 46 758 872 644.
As a consequence, 216 238 is the square root of 46 758 872 644.
The multiples of 216 238 are all integers evenly divisible by 216 238, that is all numbers such that the remainder of the division by 216 238 is zero. There are infinitely many multiples of 216 238. The smallest multiples of 216 238 are: