It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 221 227 is not a prime number.
For example, 5 221 227 can be divided by 3: 5 221 227 / 3 = 1 740 409.
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For 5 221 227 to be a prime number, it would have been required that 5 221 227 has only two divisors, i.e., itself and 1.
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5 221 227 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 5 221 227 is about 2 285.000.
Thus, the square root of 5 221 227 is not an integer, and therefore 5 221 227 is not a square number.
The square of a number (here 5 221 227) is the result of the product of this number (5 221 227) by itself (i.e., 5 221 227 × 5 221 227); the square of 5 221 227 is sometimes called "raising 5 221 227 to the power 2", or "5 221 227 squared".
The square of 5 221 227 is 27 261 211 385 529 because 5 221 227 × 5 221 227 = 5 221 2272 = 27 261 211 385 529.
As a consequence, 5 221 227 is the square root of 27 261 211 385 529.
The multiples of 5 221 227 are all integers evenly divisible by 5 221 227, that is all numbers such that the remainder of the division by 5 221 227 is zero. There are infinitely many multiples of 5 221 227. The smallest multiples of 5 221 227 are: