what is the two consecutive whole numbers that square root of 54
If your question means:
Find two consecutive whole numbers that square root of 54 lies between what two numbers?
then:
54 = 9 · 6
√ 54 = √ 9 · √ 6 = 3 √ 6 = 3 · 2.44949 = 7.34847
√ 54 = 7.34847 lies between 7 and 8