Have I lost it?

For some reason my boolean keeps getting changed. Any ideas why and where I screwed up?

Class one

Code java:

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public class PrimeTester {
 
	  public static boolean isPrime ( int num )
	  {
	    boolean prime = true;
	    int limit = (int) Math.sqrt ( num );  
 
	    for ( int i = 2; i <= limit; i++ )
	    {
	      if ( num % i == 0 )
	      {
	        prime = false;
	        break;
	      }
	    }
 
	    return prime;
	  }
 
}

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Class Two (Problem Class)

Code java:

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public static void main(String[] args) {
 
		int currentNum = 2;
		int numOfPrim = 0;
		int currentPrime = 0;
		boolean check = false;
 
		while(currentNum < 10)
		{
			System.out.println("1st check " + check);
			check = PrimeTester.isPrime(currentNum);
			System.out.println("2nd check " +check);
			if(check = true){
				System.out.println("3rd check " +check);
				numOfPrim = numOfPrim +1;
				//System.out.println("Number of Prime: " + numOfPrim);
				currentPrime = currentNum;
				System.out.println("Current Prime " + currentPrime);
				System.out.println("");
			}
			//System.out.println("3rd check " +check);
			//System.out.println("Current Num " + currentNum);
			//System.out.println("");
			currentNum = currentNum + 1;
 
		}
 
		//System.out.println(currentPrime);
 
 
	}
 
}

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Code java:

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if(check = true){

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= is the assignment operator. == is the equality check operator.

Big thanks